[llvm] [X86][SSE] Improve ISD::FP_TO_*INT_SAT vector lowering (PR #199416)

[via llvm-commits]

Panadulek wrote:

@Andarwinux @RKSimon  could you run my pr, cause the workflow waits for requires approval from maintaner.

Thanks in advance.

https://github.com/llvm/llvm-project/pull/199416