[clang] [CUDA][HIP] add option -gpuinc (PR #140106)

[Yaxun Liu via cfe-commits]

yxsamliu wrote:

> I thought we already added a generic -stdinc/nostdinc for this

there is only -nostdinc but there is no -stdinc

https://github.com/llvm/llvm-project/pull/140106