[llvm] [AMDGPU] Implement vop3p complex pattern optmization for gisel (PR #130234)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lld-x86_64-ubuntu-fast` running on `as-builder-4` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/33/builds/15076

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
53.536 [29/9/3920] Linking CXX executable bin/sancov
53.635 [29/8/3921] Linking CXX executable bin/llvm-objdump
53.654 [28/8/3922] Generating ../../bin/llvm-otool
53.676 [28/7/3923] Linking CXX executable bin/llvm-nm
53.763 [28/6/3924] Linking CXX executable bin/llvm-cfi-verify
53.952 [28/5/3925] Linking CXX executable bin/llvm-profgen
54.488 [28/4/3926] Linking CXX executable bin/llvm-jitlink
64.319 [28/3/3927] Building CXX object lib/Target/AMDGPU/CMakeFiles/LLVMAMDGPUCodeGen.dir/AMDGPUSubtarget.cpp.o
64.509 [28/2/3928] Building CXX object lib/Target/AMDGPU/CMakeFiles/LLVMAMDGPUCodeGen.dir/GCNSubtarget.cpp.o
68.552 [28/1/3929] Building CXX object lib/Target/AMDGPU/CMakeFiles/LLVMAMDGPUCodeGen.dir/AMDGPUInstructionSelector.cpp.o
FAILED: lib/Target/AMDGPU/CMakeFiles/LLVMAMDGPUCodeGen.dir/AMDGPUInstructionSelector.cpp.o 
CCACHE_CPP2=yes CCACHE_HASHDIR=yes /usr/bin/ccache /usr/bin/c++ -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/build/lib/Target/AMDGPU -I/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/AMDGPU -I/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/build/include -I/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -fvisibility=hidden  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT lib/Target/AMDGPU/CMakeFiles/LLVMAMDGPUCodeGen.dir/AMDGPUInstructionSelector.cpp.o -MF lib/Target/AMDGPU/CMakeFiles/LLVMAMDGPUCodeGen.dir/AMDGPUInstructionSelector.cpp.o.d -o lib/Target/AMDGPU/CMakeFiles/LLVMAMDGPUCodeGen.dir/AMDGPUInstructionSelector.cpp.o -c /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp: In member function ‘bool llvm::AMDGPUInstructionSelector::selectG_TRUNC(llvm::MachineInstr&) const’:
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp:2531: warning: enumerated and non-enumerated type in conditional expression [-Wextra]
 2531 |         DstSize < 32 ? AMDGPU::sub0 : TRI.getSubRegFromChannel(0, DstSize / 32);
      | 
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp: In function ‘llvm::SmallVector<std::pair<const llvm::MachineOperand*, SrcStatus> > getSrcStats(const llvm::MachineOperand*, const llvm::MachineRegisterInfo&, searchOptions, int)’:
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp:4669: error: could not convert ‘Statlist’ from ‘SmallVector<[...],4>’ to ‘SmallVector<[...],3>’
 4669 |   return Statlist;
      | 
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp: In function ‘SrcStatus getNegStatus(const llvm::MachineOperand*, SrcStatus, const llvm::MachineRegisterInfo&)’:
/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/llvm-project/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp:4554: warning: control reaches end of non-void function [-Wreturn-type]
 4554 | }
      | 
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/130234