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

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> > > > Hmm, in what cases is `-nogpuinc` added when we don't actually want it? I think we should avoid adding `-nogpuinc` if it's not needed, if possible.
> > > 
> > > 
> > > comgr is the JIT compiler for HIP on ROCm. comgr uses -nogpuinc by default. However, some users of comgr need to override that so that comgr enables the wrapper headers. We cannot simply let comgr stop using -nogpuinc by default since it will break existing comgr users. Then we need to add -gpuinc to override that.
> > 
> > 
> > I guess it's too bothersome to manually add `-include`?
> 
> The user app of comgr does not know about the clang wrapper path and name, which is internals of clang and may change.

Is it really easier to patch clang over comgr?

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