[llvm] [FPEnv] Add strictfp attribute to the FP environment manipulation intrinsics (PR #96093)

[Joshua Cranmer via llvm-commits]

https://github.com/jcranmer-intel approved this pull request.

I'm in favor of this change, but I'd also like to make sure nobody else is going to object to it.

https://github.com/llvm/llvm-project/pull/96093