[llvm] [X86] lowerFPToIntToFP - handle UI2FP on AVX512VL targets and i64 types on AVX512DQ targets (PR #162656)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

This seems more complicated than it should be - maybe just start with the AVX512DQ i64 handling in this patch?

https://github.com/llvm/llvm-project/pull/162656