[clang] [Clang] Do not emit intrinsic math functions on GPU targets (PR #98209)

[Matt Arsenault via cfe-commits]

https://github.com/arsenm commented:

This is going to break the library build. We use the __builtin functions to access the intrinsic in the cases where the llvm intrinsic lowering provides the implementation of the function. In a more sensible world, the library would not provide the implementations of functions that are implemented by the intrinsics in the first place 

https://github.com/llvm/llvm-project/pull/98209