[llvm-branch-commits] [clang] [llvm] [HLSL][RootSignature] Define and integrate rootsig clang attr and decl (PR #137690)

[Finn Plummer via llvm-branch-commits]

inbelic wrote:

This is rebased onto: https://github.com/llvm/llvm-project/pull/138326 which defines a serialization of the in-memory structures.

As such, the test-case in RootSignatures-AST.hlsl is updated to show that the values are correctly stored in the decl node.

https://github.com/llvm/llvm-project/pull/137690