[llvm] [AArch64][GlobalISel] SIMD fpcvt codegen for rounding nodes (PR #165546)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

What is the strictfp status on aarch64 with selectiondag? I thought it was mostly not implemented? I would expect a globaliseil patch for this to not be touching so many patterns, and to not combine changes to strictfp and non-strictfp cases 

https://github.com/llvm/llvm-project/pull/165546