[llvm] [MergeFunctions] Preserve entry counts on folds (PR #202218)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `intel-sycl-gpu` running on `intel-sycl-gpu-01` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/225/builds/11133

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
4.358 [666/15/3954] Linking CXX static library lib/libLLVMSPIRVInfo.a
4.359 [665/15/3955] Linking CXX static library lib/libLLVMMCDisassembler.a
4.359 [665/14/3956] Linking CXX static library lib/libLLVMDWARFCFIChecker.a
4.365 [665/13/3957] Linking CXX static library lib/libLLVMMCA.a
4.386 [665/12/3958] Linking CXX static library lib/libLLVMSPIRVDesc.a
4.581 [665/11/3959] Building X86GenFastISel.inc...
4.855 [665/10/3960] Building X86GenGlobalISel.inc...
5.168 [665/9/3961] Building CXX object lib/Object/CMakeFiles/LLVMObject.dir/IRSymtab.cpp.o
5.385 [665/8/3962] Building X86GenSubtargetInfo.inc...
5.447 [665/7/3963] Building CXX object lib/Transforms/IPO/CMakeFiles/LLVMipo.dir/MergeFunctions.cpp.o
FAILED: lib/Transforms/IPO/CMakeFiles/LLVMipo.dir/MergeFunctions.cpp.o 
CCACHE_CPP2=yes CCACHE_HASHDIR=yes CCACHE_SLOPPINESS=pch_defines,time_macros /usr/bin/ccache /usr/bin/c++ -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/lib/Transforms/IPO -I/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO -I/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/include -I/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/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-dangling-reference -Wno-redundant-move -Wno-pessimizing-move -Wno-array-bounds -Wno-stringop-overread -Wno-dangling-pointer -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 -std=c++17 -UNDEBUG -fno-exceptions -funwind-tables -fno-rtti -MD -MT lib/Transforms/IPO/CMakeFiles/LLVMipo.dir/MergeFunctions.cpp.o -MF lib/Transforms/IPO/CMakeFiles/LLVMipo.dir/MergeFunctions.cpp.o.d -o lib/Transforms/IPO/CMakeFiles/LLVMipo.dir/MergeFunctions.cpp.o -c /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp: In member function ‘void {anonymous}::MergeFunctions::writeThunk(llvm::Function*, llvm::Function*)’:
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp:737:27: error: ‘ProfileCount’ is not a member of ‘llvm::Function’
  737 |   std::optional<Function::ProfileCount> GEC = G->getEntryCount();
      |                           ^~~~~~~~~~~~
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp:737:39: error: template argument 1 is invalid
  737 |   std::optional<Function::ProfileCount> GEC = G->getEntryCount();
      |                                       ^
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp:737:63: error: cannot convert ‘std::optional<long unsigned int>’ to ‘int’ in initialization
  737 |   std::optional<Function::ProfileCount> GEC = G->getEntryCount();
      |                                               ~~~~~~~~~~~~~~~~^~
      |                                                               |
      |                                                               std::optional<long unsigned int>
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp:808:27: error: invalid type argument of unary ‘*’ (have ‘int’)
  808 |       NewG->setEntryCount(*GEC);
      |                           ^~~~
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp: At global scope:
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp:883:58: error: ‘ProfileCount’ is not a member of ‘llvm::Function’
  883 |                                  std::optional<Function::ProfileCount> FC,
      |                                                          ^~~~~~~~~~~~
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp:883:70: error: template argument 1 is invalid
  883 |                                  std::optional<Function::ProfileCount> FC,
      |                                                                      ^
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp:884:58: error: ‘ProfileCount’ is not a member of ‘llvm::Function’
  884 |                                  std::optional<Function::ProfileCount> GC) {
      |                                                          ^~~~~~~~~~~~
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp:884:70: error: template argument 1 is invalid
  884 |                                  std::optional<Function::ProfileCount> GC) {
      |                                                                      ^
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp: In function ‘void mergeEntryCountsInto(llvm::Function*, int, int)’:
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp:887:39: error: base operand of ‘->’ is not a pointer
  887 |   uint64_t Sum = SaturatingAdd(FC ? FC->getCount() : uint64_t{0},
      |                                       ^~
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp:888:39: error: base operand of ‘->’ is not a pointer
  888 |                                GC ? GC->getCount() : uint64_t{0});
      |                                       ^~
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp: In member function ‘void {anonymous}::MergeFunctions::mergeTwoFunctions(llvm::Function*, llvm::Function*)’:
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/llvm/lib/Transforms/IPO/MergeFunctions.cpp:895:27: error: ‘ProfileCount’ is not a member of ‘llvm::Function’

```

</details>

https://github.com/llvm/llvm-project/pull/202218