[X86] Add patterns for combining movss+uint_to_fp into the intrinsic instructions under AVX512.

This matches what we do for sint_to_fp.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332205 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed