[llvm] [ARM] Add instruction selection for strict FP (PR #160696)

[Erik Enikeev via llvm-commits]

Varnike wrote:

- Rebased on upstream main.
- Added strict fp tests that were mentioned in https://github.com/llvm/llvm-project/pull/137101#issuecomment-3333804350.
- Un-fixme'd several intrinsic tests where possible.

https://github.com/llvm/llvm-project/pull/160696