[clang] [llvm] [HLSL][RootSignature] Implement initial parsing of the descriptor table clause params (PR #133800)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `polly-x86_64-linux-shlib` running on `polly-x86_64-gce2` while building `clang,llvm` at step 5 "build".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/99/builds/5985

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (build) failure: 'ninja' (failure)
...
[65/230] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseAST.cpp.o
[66/230] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseExpr.cpp.o
[67/230] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseExprCXX.cpp.o
[68/230] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseHLSL.cpp.o
[69/230] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseCXXInlineMethods.cpp.o
[70/230] Building CXX object lib/CodeGen/AsmPrinter/CMakeFiles/LLVMAsmPrinter.dir/AsmPrinter.cpp.o
[71/230] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseDecl.cpp.o
[72/230] Linking CXX static library lib/libLLVMAsmPrinter.a
[73/230] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseInit.cpp.o
[74/230] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseHLSLRootSignature.cpp.o
FAILED: tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseHLSLRootSignature.cpp.o 
ccache /usr/bin/c++ -DCLANG_EXPORTS -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/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/tools/clang/lib/Parse -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Parse -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/tools/clang/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -fno-strict-aliasing -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseHLSLRootSignature.cpp.o -MF tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseHLSLRootSignature.cpp.o.d -o tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseHLSLRootSignature.cpp.o -c /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Parse/ParseHLSLRootSignature.cpp
In file included from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Parse/ParseHLSLRootSignature.h:23,
                 from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Parse/ParseHLSLRootSignature.cpp:9:
/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h:42:12: error: declaration of ‘llvm::hlsl::rootsig::Register llvm::hlsl::rootsig::DescriptorTableClause::Register’ changes meaning of ‘Register’ [-fpermissive]
   42 |   Register Register;
      |            ^~~~~~~~
/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h:28:8: note: ‘Register’ declared here as ‘struct llvm::hlsl::rootsig::Register’
   28 | struct Register {
      |        ^~~~~~~~
[75/230] Building CXX object lib/LTO/CMakeFiles/LLVMLTO.dir/LTO.cpp.o
[76/230] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseObjc.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/133800