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

[Harald van Dijk via llvm-commits]

hvdijk wrote:

It's not a bikeshedding problem that it doesn't handle other SYCL targets consistently though. In some places there are checks for SYCL, in other places there are checks for SPIR-V.

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