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

[Erik Enikeev via llvm-commits]

Varnike wrote:

> Should we add these VFP instructions too:

Added mayRaiseFPException and marked appropriate instructions from the list as using rounding bits.

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