[llvm] [ARM] Mark function calls as possibly changing FPSCR (PR #160699)

[Simon Tatham via llvm-commits]

https://github.com/statham-arm requested changes to this pull request.

Er, I should actually put the "request changes" label on this, due to the AArch64 test. Just in case it gets accidentally merged.

https://github.com/llvm/llvm-project/pull/160699