[X86][SSE] Don't decide when to scalarize CTTZ/CTLZ for performance at lowering - this is what cost models are for

Improved CTTZ/CTLZ costings will be added shortly

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277713 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed