[clang] [flang] [llvm] [clang][flang][Triple][llvm] Add isOffload function to LangOpts and isGPU function to Triple (PR #126956)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> > Seems reasonable so long as we know that sound reasonable to you?

No. This is a bikeshedding problem on the isGPU name. SPIRV is functionally a "GPU" target. The abstract future physical device it nay run on is unimportant 

https://github.com/llvm/llvm-project/pull/126956