[llvm-branch-commits] [clang] [llvm] [HLSL] Update Frontend to support version 1.2 of root signature (PR #160616)

[Finn Plummer via llvm-branch-commits]

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inbelic wrote:

We should also update https://github.com/llvm/llvm-project/blob/main/clang/test/AST/HLSL/RootSignatures-AST.hlsl to ensure the flags field is generated in the ast

https://github.com/llvm/llvm-project/pull/160616