[llvm] [DXIL] Adding support to RootSignatureFlags in obj2yaml (PR #122396)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-ppc64le-rhel` running on `ppc64le-clang-rhel-test` while building `llvm` at step 7 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/145/builds/4993

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

```
Step 7 (test-build-unified-tree-check-all) failure: test (failure)
...
0.198 [2/3/1] Building CXX object compiler-rt/lib/ubsan/CMakeFiles/RTUbsan_dynamic_version_script_dummy.powerpc64le.dir/dummy.cpp.o
0.199 [1/3/2] Building CXX object compiler-rt/lib/asan/CMakeFiles/RTAsan_dynamic_version_script_dummy.powerpc64le.dir/dummy.cpp.o
0.431 [0/3/3] Linking CXX shared library /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/lib/clang/21/lib/powerpc64le-unknown-linux-gnu/libclang_rt.ubsan_standalone.so
0.456 [0/2/4] Linking CXX shared library /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/lib/clang/21/lib/powerpc64le-unknown-linux-gnu/libclang_rt.asan.so
1.171 [0/1/5] Generating /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/compile_commands.json
23.881 [5/3/1211] cd /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/runtimes/runtimes-bins && /home/buildbots/llvm-external-buildbots/cmake-3.31.2/bin/cmake --build /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/runtimes/runtimes-bins/ --target runtimes-test-depends --config Release
ninja: no work to do.
23.948 [4/3/1212] No install step for 'runtimes'
23.971 [3/3/1214] Completed 'runtimes'
24.436 [3/2/1215] Building CXX object unittests/Object/CMakeFiles/ObjectTests.dir/DXContainerTest.cpp.o
FAILED: unittests/Object/CMakeFiles/ObjectTests.dir/DXContainerTest.cpp.o 
ccache /home/buildbots/llvm-external-buildbots/clang.19.1.7/bin/clang++ --gcc-toolchain=/gcc-toolchain/usr -DGTEST_HAS_RTTI=0 -DLLVM_BUILD_STATIC -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/unittests/Object -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/unittests/Object -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/third-party/unittest/googletest/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/third-party/unittest/googlemock/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror -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 -std=c++17  -Wno-variadic-macros -Wno-gnu-zero-variadic-macro-arguments -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -Wno-suggest-override -MD -MT unittests/Object/CMakeFiles/ObjectTests.dir/DXContainerTest.cpp.o -MF unittests/Object/CMakeFiles/ObjectTests.dir/DXContainerTest.cpp.o.d -o unittests/Object/CMakeFiles/ObjectTests.dir/DXContainerTest.cpp.o -c /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/unittests/Object/DXContainerTest.cpp
In file included from /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/unittests/Object/DXContainerTest.cpp:15:
In file included from /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/include/llvm/Testing/Support/Error.h:13:
In file included from /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/include/llvm/Testing/Support/SupportHelpers.h:17:
In file included from /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/third-party/unittest/googlemock/include/gmock/gmock-matchers.h:274:
In file included from /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/third-party/unittest/googlemock/include/gmock/internal/gmock-internal-utils.h:50:
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/third-party/unittest/googletest/include/gtest/gtest.h:1379:11: error: comparison of integers of different signs: 'const unsigned int' and 'const int' [-Werror,-Wsign-compare]
 1379 |   if (lhs == rhs) {
      |       ~~~ ^  ~~~
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/third-party/unittest/googletest/include/gtest/gtest.h:1398:12: note: in instantiation of function template specialization 'testing::internal::CmpHelperEQ<unsigned int, int>' requested here
 1398 |     return CmpHelperEQ(lhs_expression, rhs_expression, lhs, rhs);
      |            ^
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/unittests/Object/DXContainerTest.cpp:840:5: note: in instantiation of function template specialization 'testing::internal::EqHelper::Compare<unsigned int, int, nullptr>' requested here
  840 |     ASSERT_EQ(RS->getVersion(), 2);
      |     ^
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/third-party/unittest/googletest/include/gtest/gtest.h:1898:31: note: expanded from macro 'ASSERT_EQ'
 1898 | #define ASSERT_EQ(val1, val2) GTEST_ASSERT_EQ(val1, val2)
      |                               ^
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/third-party/unittest/googletest/include/gtest/gtest.h:1882:54: note: expanded from macro 'GTEST_ASSERT_EQ'
 1882 |   ASSERT_PRED_FORMAT2(::testing::internal::EqHelper::Compare, val1, val2)
      |                                                      ^
1 error generated.
26.995 [3/1/1216] Building CXX object unittests/ObjectYAML/CMakeFiles/ObjectYAMLTests.dir/DXContainerYAMLTest.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/122396