[llvm] [DirectX] Implement the DXILCBufferAccess pass (PR #134571)

[Farzon Lotfi via llvm-commits]

farzonl wrote:

I'm seeing a pretty large regression in the DML shaders that are able to compile in the form `Load of {{.*}} is not a global resource handle`. 



https://github.com/llvm/llvm-project/pull/134571