[llvm] [Offload] Add an `unloadBinary` interface to PluginInterface (PR #143873)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `amdgpu-offload-rhel-9-cmake-build-only` running on `rocm-docker-rhel-9` while building `offload` at step 4 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/205/builds/13336

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 4 (annotate) failure: '../llvm-zorg/zorg/buildbot/builders/annotated/amdgpu-offload-cmake.py --jobs=32' (failure)
...
[35/67] Linking CXX shared library /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/lib/clang/21/lib/x86_64-unknown-linux-gnu/libclang_rt.asan.so
[36/67] Generating /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/compile_commands.json
[37/67] Building LLVM bitcode Workshare.cpp-amdgpu.o
[38/67] Building LLVM bitcode Parallelism.cpp-amdgpu.o
[39/67] Linking CXX executable /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/lib/libomptarget-amdgpu.bc
clang++: warning: joined argument expects additional value: '-mcpu=' [-Wunused-command-line-argument]
[40/67] Linking CXX static library /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/lib/amdgcn-amd-amdhsa/libompdevice.a
[41/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/OpenMP/Mapping.cpp.o
[42/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/OffloadRTL.cpp.o
[43/67] Building CXX object offload/plugins-nextgen/host/CMakeFiles/omptarget.rtl.host.dir/src/rtl.cpp.o
FAILED: offload/plugins-nextgen/host/CMakeFiles/omptarget.rtl.host.dir/src/rtl.cpp.o 
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/./bin/clang++ --target=x86_64-unknown-linux-gnu -DDEBUG_PREFIX="\"TARGET x86_64 RTL\"" -DGTEST_HAS_RTTI=0 -DOMPT_SUPPORT=1 -DTARGET_NAME=x86_64 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/runtimes/runtimes-bins/openmp/runtime/src -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/offload/plugins-nextgen/common/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/runtimes/runtimes-bins/offload/plugins-nextgen/common/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/offload/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/runtimes/runtimes-bins/offload/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17 -fPIC  -fno-exceptions -funwind-tables -fno-rtti -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -fno-exceptions -fno-rtti -Werror=global-constructors -MD -MT offload/plugins-nextgen/host/CMakeFiles/omptarget.rtl.host.dir/src/rtl.cpp.o -MF offload/plugins-nextgen/host/CMakeFiles/omptarget.rtl.host.dir/src/rtl.cpp.o.d -o offload/plugins-nextgen/host/CMakeFiles/omptarget.rtl.host.dir/src/rtl.cpp.o -c /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/offload/plugins-nextgen/host/src/rtl.cpp
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/offload/plugins-nextgen/host/src/rtl.cpp:417:16: error: allocating an object of abstract class type 'GenELF64DeviceTy'
  417 |     return new GenELF64DeviceTy(Plugin, DeviceId, NumDevices);
      |                ^
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/offload/plugins-nextgen/common/include/PluginInterface.h:757:17: note: unimplemented pure virtual method 'unloadBinaryImpl' in 'GenELF64DeviceTy'
  757 |   virtual Error unloadBinaryImpl(DeviceImageTy *Image) = 0;
      |                 ^
1 error generated.
[44/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/OpenMP/InteropAPI.cpp.o
[45/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/LegacyAPI.cpp.o
[46/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/OpenMP/API.cpp.o
[47/67] Building CXX object offload/plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/GlobalHandler.cpp.o
[48/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/interface.cpp.o
[49/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/device.cpp.o
[50/67] Building CXX object offload/liboffload/CMakeFiles/LLVMOffload.dir/src/OffloadLib.cpp.o
[51/67] Building CXX object offload/liboffload/CMakeFiles/LLVMOffload.dir/src/OffloadImpl.cpp.o
[52/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/omptarget.cpp.o
[53/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/PluginManager.cpp.o
[54/67] Building CXX object offload/plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/PluginInterface.cpp.o
[55/67] Building CXX object offload/plugins-nextgen/cuda/CMakeFiles/omptarget.rtl.cuda.dir/src/rtl.cpp.o
[56/67] Building CXX object offload/plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/JIT.cpp.o
[57/67] Building CXX object offload/plugins-nextgen/amdgpu/CMakeFiles/omptarget.rtl.amdgpu.dir/src/rtl.cpp.o
[58/67] Building CXX object offload/plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/RPC.cpp.o
ninja: build stopped: subcommand failed.
FAILED: runtimes/runtimes-stamps/runtimes-build /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/runtimes/runtimes-stamps/runtimes-build 
cd /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/runtimes/runtimes-bins && /usr/bin/cmake --build .
[7879/7882] Building CXX object tools/flang/tools/bbc/CMakeFiles/bbc.dir/bbc.cpp.o
ninja: build stopped: subcommand failed.
['ninja'] exited with return code 1.
The build step threw an exception...
Traceback (most recent call last):
  File "/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/../llvm-zorg/zorg/buildbot/builders/annotated/amdgpu-offload-cmake.py", line 50, in step
    yield
  File "/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/../llvm-zorg/zorg/buildbot/builders/annotated/amdgpu-offload-cmake.py", line 41, in main
    run_command(["ninja"])
  File "/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/../llvm-zorg/zorg/buildbot/builders/annotated/amdgpu-offload-cmake.py", line 63, in run_command
    util.report_run_cmd(cmd, cwd=directory)
  File "/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-zorg/zorg/buildbot/builders/annotated/util.py", line 49, in report_run_cmd
Step 7 (build cmake config) failure: build cmake config (failure)
...
[35/67] Linking CXX shared library /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/lib/clang/21/lib/x86_64-unknown-linux-gnu/libclang_rt.asan.so
[36/67] Generating /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/compile_commands.json
[37/67] Building LLVM bitcode Workshare.cpp-amdgpu.o
[38/67] Building LLVM bitcode Parallelism.cpp-amdgpu.o
[39/67] Linking CXX executable /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/lib/libomptarget-amdgpu.bc
clang++: warning: joined argument expects additional value: '-mcpu=' [-Wunused-command-line-argument]
[40/67] Linking CXX static library /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/lib/amdgcn-amd-amdhsa/libompdevice.a
[41/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/OpenMP/Mapping.cpp.o
[42/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/OffloadRTL.cpp.o
[43/67] Building CXX object offload/plugins-nextgen/host/CMakeFiles/omptarget.rtl.host.dir/src/rtl.cpp.o
FAILED: offload/plugins-nextgen/host/CMakeFiles/omptarget.rtl.host.dir/src/rtl.cpp.o 
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/./bin/clang++ --target=x86_64-unknown-linux-gnu -DDEBUG_PREFIX="\"TARGET x86_64 RTL\"" -DGTEST_HAS_RTTI=0 -DOMPT_SUPPORT=1 -DTARGET_NAME=x86_64 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/runtimes/runtimes-bins/openmp/runtime/src -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/offload/plugins-nextgen/common/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/runtimes/runtimes-bins/offload/plugins-nextgen/common/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/offload/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/runtimes/runtimes-bins/offload/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17 -fPIC  -fno-exceptions -funwind-tables -fno-rtti -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -fno-exceptions -fno-rtti -Werror=global-constructors -MD -MT offload/plugins-nextgen/host/CMakeFiles/omptarget.rtl.host.dir/src/rtl.cpp.o -MF offload/plugins-nextgen/host/CMakeFiles/omptarget.rtl.host.dir/src/rtl.cpp.o.d -o offload/plugins-nextgen/host/CMakeFiles/omptarget.rtl.host.dir/src/rtl.cpp.o -c /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/offload/plugins-nextgen/host/src/rtl.cpp
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/offload/plugins-nextgen/host/src/rtl.cpp:417:16: error: allocating an object of abstract class type 'GenELF64DeviceTy'
  417 |     return new GenELF64DeviceTy(Plugin, DeviceId, NumDevices);
      |                ^
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/offload/plugins-nextgen/common/include/PluginInterface.h:757:17: note: unimplemented pure virtual method 'unloadBinaryImpl' in 'GenELF64DeviceTy'
  757 |   virtual Error unloadBinaryImpl(DeviceImageTy *Image) = 0;
      |                 ^
1 error generated.
[44/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/OpenMP/InteropAPI.cpp.o
[45/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/LegacyAPI.cpp.o
[46/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/OpenMP/API.cpp.o
[47/67] Building CXX object offload/plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/GlobalHandler.cpp.o
[48/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/interface.cpp.o
[49/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/device.cpp.o
[50/67] Building CXX object offload/liboffload/CMakeFiles/LLVMOffload.dir/src/OffloadLib.cpp.o
[51/67] Building CXX object offload/liboffload/CMakeFiles/LLVMOffload.dir/src/OffloadImpl.cpp.o
[52/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/omptarget.cpp.o
[53/67] Building CXX object offload/libomptarget/CMakeFiles/omptarget.dir/PluginManager.cpp.o
[54/67] Building CXX object offload/plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/PluginInterface.cpp.o
[55/67] Building CXX object offload/plugins-nextgen/cuda/CMakeFiles/omptarget.rtl.cuda.dir/src/rtl.cpp.o
[56/67] Building CXX object offload/plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/JIT.cpp.o
[57/67] Building CXX object offload/plugins-nextgen/amdgpu/CMakeFiles/omptarget.rtl.amdgpu.dir/src/rtl.cpp.o
[58/67] Building CXX object offload/plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/RPC.cpp.o
ninja: build stopped: subcommand failed.
FAILED: runtimes/runtimes-stamps/runtimes-build /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/runtimes/runtimes-stamps/runtimes-build 
cd /home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/runtimes/runtimes-bins && /usr/bin/cmake --build .
[7879/7882] Building CXX object tools/flang/tools/bbc/CMakeFiles/bbc.dir/bbc.cpp.o
ninja: build stopped: subcommand failed.
['ninja'] exited with return code 1.
The build step threw an exception...
Traceback (most recent call last):
  File "/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/../llvm-zorg/zorg/buildbot/builders/annotated/amdgpu-offload-cmake.py", line 50, in step
    yield
  File "/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/../llvm-zorg/zorg/buildbot/builders/annotated/amdgpu-offload-cmake.py", line 41, in main
    run_command(["ninja"])
  File "/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/../llvm-zorg/zorg/buildbot/builders/annotated/amdgpu-offload-cmake.py", line 63, in run_command
    util.report_run_cmd(cmd, cwd=directory)
  File "/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-zorg/zorg/buildbot/builders/annotated/util.py", line 49, in report_run_cmd

```

</details>

https://github.com/llvm/llvm-project/pull/143873