[llvm] [CodeGen] Introduce `MachineDomTreeUpdater` (PR #95369)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-flang-rhel-clang` running on `ppc64le-flang-rhel-test` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/157/builds/1107

Here is the relevant piece of the build log for the reference:
```
Step 5 (build-unified-tree) failure: build (failure)
...
18.784 [512/427/5519] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/TargetOptionsImpl.cpp.o
18.958 [512/426/5520] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveRegUnits.cpp.o
18.958 [512/425/5521] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/OptimizePHIs.cpp.o
19.204 [512/424/5522] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/StackMapLivenessAnalysis.cpp.o
19.279 [512/423/5523] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/AllocationOrder.cpp.o
19.318 [512/422/5524] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/EdgeBundles.cpp.o
19.634 [512/421/5525] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/RegisterClassInfo.cpp.o
19.861 [512/420/5526] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineSizeOpts.cpp.o
19.876 [512/419/5527] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/HIPUtility.cpp.o
19.999 [512/418/5528] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachinePostDominators.cpp.o
FAILED: lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachinePostDominators.cpp.o 
ccache /home/buildbots/llvm-external-buildbots/clang.16.0.1/bin/clang++ -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/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/lib/CodeGen -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/lib/CodeGen -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/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 -pedantic -Wno-long-long -Wc++98-compat-extra-semi -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  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachinePostDominators.cpp.o -MF lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachinePostDominators.cpp.o.d -o lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachinePostDominators.cpp.o -c /home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/lib/CodeGen/MachinePostDominators.cpp
In file included from /home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/lib/CodeGen/MachinePostDominators.cpp:14:
/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/include/llvm/CodeGen/MachinePostDominators.h:53:3: error: constructor cannot be redeclared
  MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
  ^
/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/include/llvm/CodeGen/MachinePostDominators.h:51:12: note: previous definition is here
  explicit MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
           ^
1 error generated.
20.226 [512/417/5529] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/SlotIndexes.cpp.o
20.291 [512/416/5530] Building CXX object lib/CodeGen/GlobalISel/CMakeFiles/LLVMGlobalISel.dir/GIMatchTableExecutor.cpp.o
20.300 [512/415/5531] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/FuncletLayout.cpp.o
20.543 [512/414/5532] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineOptimizationRemarkEmitter.cpp.o
20.617 [512/413/5533] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDomTreeUpdater.cpp.o
FAILED: lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDomTreeUpdater.cpp.o 
ccache /home/buildbots/llvm-external-buildbots/clang.16.0.1/bin/clang++ -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/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/lib/CodeGen -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/lib/CodeGen -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/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 -pedantic -Wno-long-long -Wc++98-compat-extra-semi -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  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDomTreeUpdater.cpp.o -MF lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDomTreeUpdater.cpp.o.d -o lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDomTreeUpdater.cpp.o -c /home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/lib/CodeGen/MachineDomTreeUpdater.cpp
In file included from /home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/lib/CodeGen/MachineDomTreeUpdater.cpp:14:
In file included from /home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/include/llvm/CodeGen/MachineDomTreeUpdater.h:21:
/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/include/llvm/CodeGen/MachinePostDominators.h:53:3: error: constructor cannot be redeclared
  MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
  ^
/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/llvm/include/llvm/CodeGen/MachinePostDominators.h:51:12: note: previous definition is here
  explicit MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
           ^
1 error generated.
20.695 [512/412/5534] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/RegUsageInfoCollector.cpp.o
20.711 [512/411/5535] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineSSAContext.cpp.o
20.715 [512/410/5536] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/PseudoSourceValue.cpp.o
20.847 [512/409/5537] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/RegUsageInfoPropagate.cpp.o
20.861 [512/408/5538] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LazyMachineBlockFrequencyInfo.cpp.o
20.923 [512/407/5539] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/RegisterUsageInfo.cpp.o
20.998 [512/406/5540] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveIntervalCalc.cpp.o
21.047 [512/405/5541] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LivePhysRegs.cpp.o
21.082 [512/404/5542] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveStacks.cpp.o
21.140 [512/403/5543] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineFrameInfo.cpp.o
21.200 [512/402/5544] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/GCEmptyBasicBlocks.cpp.o
21.217 [512/401/5545] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/PostRAHazardRecognizer.cpp.o
21.218 [512/400/5546] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/PatchableFunction.cpp.o

```

https://github.com/llvm/llvm-project/pull/95369