[X86] Remove '#ifdef __x86_64__' around mask_set1_epi64 intrinsics.

The unmasked versions already didn't have this restrction. I don't think gcc or icc limit these to 64-bit mode so we shouldn't either.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@330681 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed