[X86] Use an FP-based expansion for v4i32 ctlz on SSE2-only targets#167034

NishiB137 wants to merge 2 commits intollvm:mainllvm/llvm-project:mainfrom

VindhyaP312:fp-ctlz-loweringVindhyaP312/llvm-project:fp-ctlz-loweringCopy head branch name to clipboard