[X86] Added cmov target to memcmp test

[X86] Added cmov target to memcmp test

As discussed by @spatel on D35067:

"I added the cmov attribute to the 32-bit codegen test because it removes some noise for that file. I think the intent for the SSE vs no-SSE runs is to show the potential difference for the 16 and 32 byte cases rather than the lack of cmov (which has been available for all CPUs since SSE1, so that's why it shows up automatically with -mattr=sse2)."

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308309 91177308-0d34-0410-b5e6-96231b3b80d8