Parameter InputModifier like in/out/inout

[python3kgae]

Support InputModifier like in/out/inout
https://learn.microsoft.com/en-us/windows/win32/direct3dhlsl/dx-graphics-hlsl-function-parameters

[llvm-beanz]

This is related to 67692.

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Xiang Li (python3kgae)

Support InputModifier like in/out/inout https://learn.microsoft.com/en-us/windows/win32/direct3dhlsl/dx-graphics-hlsl-function-parameters