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

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-ubuntu` running on `linaro-lldb-aarch64-ubuntu` while building `llvm` at step 4 "build".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/59/builds/638

Here is the relevant piece of the build log for the reference:
```
Step 4 (build) failure: build (failure)
...
66.512 [5619/10/586] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveRangeShrink.cpp.o
66.522 [5618/10/587] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LowLevelTypeUtils.cpp.o
66.552 [5617/10/588] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LowerEmuTLS.cpp.o
66.720 [5616/10/589] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveIntervals.cpp.o
66.819 [5616/9/590] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveStacks.cpp.o
68.421 [5616/8/591] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LoopTraversal.cpp.o
69.622 [5616/7/592] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LocalStackSlotAllocation.cpp.o
70.359 [5615/7/593] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveVariables.cpp.o
70.422 [5615/6/594] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveDebugVariables.cpp.o
70.795 [5615/5/595] 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/lldb-aarch64-ubuntu/build/lib/CodeGen -I/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/llvm/lib/CodeGen -I/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/include -I/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/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  -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 /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/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.
71.368 [5615/4/596] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBranchProbabilityInfo.cpp.o
71.419 [5615/3/597] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBlockFrequencyInfo.cpp.o
73.857 [5615/2/598] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachineBasicBlock.cpp.o
74.536 [5615/1/599] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LLVMTargetMachine.cpp.o
ninja: build stopped: subcommand failed.

```

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