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

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `polly-arm-linux` running on `hexagon-build-02` while building `llvm` at step 5 "build".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/90/builds/354

Here is the relevant piece of the build log for the reference:
```
Step 5 (build) failure: 'ninja -j16' (failure)
...
[508/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveStacks.cpp.o
[509/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/CodeGenPrepare.cpp.o
[510/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveRangeEdit.cpp.o
[511/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LocalStackSlotAllocation.cpp.o
[512/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LowerEmuTLS.cpp.o
[513/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBranchProbabilityInfo.cpp.o
[514/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveVariables.cpp.o
[515/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveDebugVariables.cpp.o
[516/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineCFGPrinter.cpp.o
[517/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBlockPlacement.cpp.o
FAILED: lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBlockPlacement.cpp.o 
/local/clang+llvm-12.0.0-x86_64-linux-gnu-ubuntu-16.04/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/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.obj/lib/CodeGen -I/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/lib/CodeGen -I/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.obj/include -I/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/include -stdlib=libc++ -fPIC -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  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBlockPlacement.cpp.o -MF lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBlockPlacement.cpp.o.d -o lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBlockPlacement.cpp.o -c /local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/lib/CodeGen/MachineBlockPlacement.cpp
In file included from /local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/lib/CodeGen/MachineBlockPlacement.cpp:44:
/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/include/llvm/CodeGen/MachinePostDominators.h:53:3: error: constructor cannot be redeclared
  MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
  ^
/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/include/llvm/CodeGen/MachinePostDominators.h:51:12: note: previous definition is here
  explicit MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
           ^
1 error generated.
[518/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDomTreeUpdater.cpp.o
FAILED: lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDomTreeUpdater.cpp.o 
/local/clang+llvm-12.0.0-x86_64-linux-gnu-ubuntu-16.04/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/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.obj/lib/CodeGen -I/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/lib/CodeGen -I/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.obj/include -I/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/include -stdlib=libc++ -fPIC -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  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -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 /local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/lib/CodeGen/MachineDomTreeUpdater.cpp
In file included from /local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/lib/CodeGen/MachineDomTreeUpdater.cpp:14:
In file included from /local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/include/llvm/CodeGen/MachineDomTreeUpdater.h:21:
/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/include/llvm/CodeGen/MachinePostDominators.h:53:3: error: constructor cannot be redeclared
  MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
  ^
/local/mnt/workspace/bots/hexagon-build-02/polly-arm-linux/llvm.src/llvm/include/llvm/CodeGen/MachinePostDominators.h:51:12: note: previous definition is here
  explicit MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
           ^
1 error generated.
[519/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineCombiner.cpp.o
[520/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineCheckDebugify.cpp.o
[521/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineConvergenceVerifier.cpp.o
[522/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBlockFrequencyInfo.cpp.o
[523/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDominanceFrontier.cpp.o
[524/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineCycleAnalysis.cpp.o
[525/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineCSE.cpp.o
[526/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineCopyPropagation.cpp.o
[527/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineFrameInfo.cpp.o
[528/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBasicBlock.cpp.o
[529/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LLVMTargetMachine.cpp.o
[530/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDebugify.cpp.o
[531/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDominators.cpp.o
[532/4101] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineFunction.cpp.o
ninja: build stopped: subcommand failed.

```

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