[PATCH] Enable FeatureFastUAMem for btver2

[Sanjay Patel]

Hi qcolombet, andreadb, hfinkel,

Allow unaligned 16-byte memop codegen for btver2. No functional changes for any other subtargets.

The bigger change is replacing the existing supposed small memcpy test with an actual test of a small memcpy. The previous test wasn't using FileCheck either.

This patch should allow us to close PR21541 ( http://llvm.org/bugs/show_bug.cgi?id=21541 ).

http://reviews.llvm.org/D6360

Files:
  lib/Target/X86/X86.td
  test/CodeGen/X86/small-byval-memcpy.ll
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