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

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-aarch64-debug-reverse-iteration` running on `linaro-flang-aarch64-debug-reverse-iteration` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/20/builds/406

Here is the relevant piece of the build log for the reference:
```
Step 5 (build-unified-tree) failure: build (failure)
...
64.608 [4635/74/1849] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineFrameInfo.cpp.o
64.764 [4633/75/1850] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/ExpandLargeDivRem.cpp.o
64.918 [4633/74/1851] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/ExpandMemCmp.cpp.o
65.066 [4633/73/1852] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/BasicBlockSectionsProfileReader.cpp.o
65.160 [4629/76/1853] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/FixupStatepointCallerSaved.cpp.o
65.443 [4627/77/1854] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/IfConversion.cpp.o
65.627 [4627/76/1855] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineLoopUtils.cpp.o
65.643 [4627/75/1856] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBlockFrequencyInfo.cpp.o
65.660 [4623/78/1857] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineCycleAnalysis.cpp.o
65.912 [4620/80/1858] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDomTreeUpdater.cpp.o
FAILED: lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDomTreeUpdater.cpp.o 
/usr/local/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/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/lib/CodeGen -I/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/llvm/lib/CodeGen -I/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/include -I/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/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 -g  -fno-exceptions -funwind-tables -fno-rtti -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 /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/llvm/lib/CodeGen/MachineDomTreeUpdater.cpp
In file included from ../llvm-project/llvm/lib/CodeGen/MachineDomTreeUpdater.cpp:14:
In file included from ../llvm-project/llvm/include/llvm/CodeGen/MachineDomTreeUpdater.h:21:
../llvm-project/llvm/include/llvm/CodeGen/MachinePostDominators.h:53:3: error: constructor cannot be redeclared
   53 |   MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
      |   ^
../llvm-project/llvm/include/llvm/CodeGen/MachinePostDominators.h:51:12: note: previous definition is here
   51 |   explicit MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
      |            ^
1 error generated.
65.933 [4620/79/1859] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineFunctionPrinterPass.cpp.o
65.962 [4620/78/1860] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBlockPlacement.cpp.o
FAILED: lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBlockPlacement.cpp.o 
/usr/local/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/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/lib/CodeGen -I/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/llvm/lib/CodeGen -I/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/include -I/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/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 -g  -fno-exceptions -funwind-tables -fno-rtti -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 /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/llvm/lib/CodeGen/MachineBlockPlacement.cpp
In file included from ../llvm-project/llvm/lib/CodeGen/MachineBlockPlacement.cpp:44:
../llvm-project/llvm/include/llvm/CodeGen/MachinePostDominators.h:53:3: error: constructor cannot be redeclared
   53 |   MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
      |   ^
../llvm-project/llvm/include/llvm/CodeGen/MachinePostDominators.h:51:12: note: previous definition is here
   51 |   explicit MachinePostDominatorTree(MachineFunction &MF) { recalculate(MF); }
      |            ^
1 error generated.
65.983 [4620/77/1861] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineInstrBundle.cpp.o
66.078 [4620/76/1862] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/GCRootLowering.cpp.o
66.096 [4620/75/1863] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/DwarfEHPrepare.cpp.o
66.135 [4620/74/1864] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineDominanceFrontier.cpp.o
66.196 [4620/73/1865] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveDebugVariables.cpp.o
66.262 [4620/72/1866] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/InterleavedAccessPass.cpp.o
66.355 [4620/71/1867] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/InterleavedLoadCombinePass.cpp.o
66.884 [4620/70/1868] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineCheckDebugify.cpp.o
66.933 [4620/69/1869] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineSSAContext.cpp.o
67.039 [4620/68/1870] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MIRYamlMapping.cpp.o
67.101 [4620/67/1871] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineCopyPropagation.cpp.o
67.992 [4620/66/1872] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineOptimizationRemarkEmitter.cpp.o
68.112 [4620/65/1873] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveIntervals.cpp.o
68.213 [4620/64/1874] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/PHIEliminationUtils.cpp.o
68.319 [4620/63/1875] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MBFIWrapper.cpp.o
68.494 [4620/62/1876] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineCSE.cpp.o

```

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