Revert "Make '-mtune=x86_64' assume fast unaligned memory accesses."

Accidental commit... git svn betrayed me. Sorry for the noise.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169741 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed