[llvm] [ARM] Add mayRaiseFPException to appropriate instructions and mark all instructions that read/write fpscr rounding bits as doing so (PR #160698)

[David Green via llvm-commits]

davemgreen wrote:

Oh OK, I see because of the exact flag. For the fcvts too? It seems they would set exceptions on nan inputs.

https://github.com/llvm/llvm-project/pull/160698