[llvm] [AArch64][GISel] Add fp128 and i128 sitofp/uitofp handling (PR #97691)

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

This looks OK, and looks very similar to the fp->int conversions. I'm not sure if there is a way to improve the i128->f16 convert without needing to introduce other libcalls.

LGTM

https://github.com/llvm/llvm-project/pull/97691