[clang] [clang][Interp] Start implementing unions and changing the active member (PR #102723)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-windows` running on `sanitizer-windows` while building `clang` at step 4 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/107/builds/1721

Here is the relevant piece of the build log for the reference:
```
Step 4 (annotate) failure: 'python ../llvm-zorg/zorg/buildbot/builders/annotated/sanitizer-windows.py ...' (failure)
...
[27/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\Program.cpp.obj
[28/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\Function.cpp.obj
[29/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\State.cpp.obj
[30/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\MemberPointer.cpp.obj
[31/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\InterpFrame.cpp.obj
[32/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\EvaluationResult.cpp.obj
[33/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\ExprConstant.cpp.obj
[34/39] Linking CXX executable bin\lld.exe
[35/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\ASTContext.cpp.obj
[36/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\Disasm.cpp.obj
command timed out: 1200 seconds without output running ['python', '../llvm-zorg/zorg/buildbot/builders/annotated/sanitizer-windows.py', '--jobs=16'], attempting to kill
program finished with exit code 1
elapsedTime=1286.090000
Step 7 (stage 1 build) failure: stage 1 build (failure)
@@@BUILD_STEP stage 1 build@@@
Running: ninja -j 16 compiler-rt
[1/2] Building CXX object projects\compiler-rt\lib\asan\CMakeFiles\RTAsan_dynamic_version_script_dummy.x86_64.dir\dummy.cpp.obj
[2/2] Linking CXX shared library lib\clang\20\lib\windows\clang_rt.asan_dynamic-x86_64.dll
Running: ninja -j 16 clang lld
[1/39] Generating VCSRevision.h
[2/39] Generating VCSVersion.inc
[3/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\PrimType.cpp.obj
[4/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\InterpStack.cpp.obj
[5/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\Descriptor.cpp.obj
[6/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\InterpState.cpp.obj
[7/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\DynamicAllocator.cpp.obj
[8/39] Building CXX object tools\clang\lib\Basic\CMakeFiles\obj.clangBasic.dir\Version.cpp.obj
[9/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\ByteCodeEmitter.cpp.obj
[10/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\Pointer.cpp.obj
[11/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\Context.cpp.obj
[12/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\InterpBuiltin.cpp.obj
[13/39] Building CXX object lib\Object\CMakeFiles\LLVMObject.dir\IRSymtab.cpp.obj
[14/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\Compiler.cpp.obj
[15/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\EvalEmitter.cpp.obj
[16/39] Linking CXX static library lib\LLVMObject.lib
[17/39] Linking CXX static library lib\clangBasic.lib
[18/39] Generating VCSVersion.inc
[19/39] Building CXX object lib\CodeGen\AsmPrinter\CMakeFiles\LLVMAsmPrinter.dir\AsmPrinter.cpp.obj
[20/39] Building CXX object tools\lld\Common\CMakeFiles\lldCommon.dir\Version.cpp.obj
[21/39] Linking CXX static library lib\lldCommon.lib
[22/39] Linking CXX static library lib\LLVMAsmPrinter.lib
[23/39] Building CXX object lib\LTO\CMakeFiles\LLVMLTO.dir\LTO.cpp.obj
[24/39] Linking CXX static library lib\LLVMLTO.lib
[25/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\InterpBlock.cpp.obj
[26/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\Record.cpp.obj
[27/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\Program.cpp.obj
[28/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\Function.cpp.obj
[29/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\State.cpp.obj
[30/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\MemberPointer.cpp.obj
[31/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\InterpFrame.cpp.obj
[32/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\EvaluationResult.cpp.obj
[33/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\ExprConstant.cpp.obj
[34/39] Linking CXX executable bin\lld.exe
[35/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\ASTContext.cpp.obj
[36/39] Building CXX object tools\clang\lib\AST\CMakeFiles\obj.clangAST.dir\Interp\Disasm.cpp.obj

command timed out: 1200 seconds without output running ['python', '../llvm-zorg/zorg/buildbot/builders/annotated/sanitizer-windows.py', '--jobs=16'], attempting to kill
program finished with exit code 1
elapsedTime=1286.090000

```

https://github.com/llvm/llvm-project/pull/102723