[X86] Don't fold unaligned loads into SSE ROUNDPS/ROUNDPD for ceil/floor/nearbyint/rint/trunc.

Incorrect patterns were added in r334460. This changes them to check alignment properly for SSE.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335062 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed