[SM6.10] Track LinAlg shader feature usage - #8884

Adds SM 6.10 Linear Algebra usage tracking to shader flags, RDAT metadata, and validation fixtures.

Changes:

• Detects LinAlg DXIL operations.
• Defines and emits Linear Algebra feature metadata.
• Updates validation fixtures across operations and shader stages.

Unresolved findings include incomplete feature enumeration, a missed invalid fixture, lost precision flags in two fixtures, and missing RDAT/compiler tests and release-note coverage.

Suppressed comments (2)

include/dxc/DxilContainer/RDAT_LibraryTypes.inl:86

• The new FeatureInfo2 serialization is not covered by the updated .ll validator fixtures, which only exercise raw shader flags. Please add a lib_6_10 RDAT test that checks (LinearAlgebra) on a function using a LinAlg intrinsic, analogous to tools/clang/test/HLSLFileCheck/d3dreflect/rdat_mintarget/sm68_extendedcommandinfo.hlsl.

  RDAT_ENUM_VALUE(LinearAlgebra, 0x2)

lib/DXIL/DxilShaderFlags.cpp:591

• The changed .ll fixtures manually declare the new bit, but none verifies that compiling HLSL with a LinAlg operation actually emits ShaderFeatureInfo_LinearAlgebra in module and per-function RDAT metadata. Please add a compiler-output test (including a library function/caller case) so regressions in this collection and propagation path are detected.

        if (hlsl::OP::IsDxilOpLinAlgFunc(CI->getCalledFunction()))
          hasLinearAlgebra = true;

• Files reviewed: 42/42 changed files
• Comments generated: 5
• Review effort level: Balanced

• Files reviewed: 44/44 changed files
• Comments generated: 0 new
• Review effort level: Balanced

Suppressed comments (1)

Previously missed (1) — in code that hasn't changed since the last review.

lib/DXIL/DxilShaderFlags.cpp:591

• The validation fixtures only hard-code the new metadata bit, so they do not independently verify that compilation emits it or that per-function library/RDAT propagation is correct. Please add a compiler-output test (following the d3dreflect/rdat_mintarget tests) that checks FeatureInfo2: (LinearAlgebra) for a direct LinAlg user and a transitive caller, while an unrelated export remains unflagged.

• Files reviewed: 47/47 changed files
• Comments generated: 0 new
• Review effort level: Balanced