Revert "[x86] Combine x86mmx/i64 to v2i64 conversion to use scalar_to_vector"

This reverts commits r226953 and r226974.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227248 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed