[PATCH] [X86] Enable FeatureFastUAMem for Silvermont processor

[Alexey Volkov]

Hi nadav,

This patch enables fast unaligned memory access feature for Atom Silvermont processor: 
unaligned loads and stores are no longer ucoded on Silvermont.

http://llvm-reviews.chandlerc.com/D2982

Files:
  lib/Target/X86/X86.td

Index: lib/Target/X86/X86.td
===================================================================
--- lib/Target/X86/X86.td
+++ lib/Target/X86/X86.td
@@ -227,7 +227,7 @@
                                FeaturePCLMUL, FeatureAES,
                                FeatureCallRegIndirect,
                                FeaturePRFCHW,
-                               FeatureSlowBTMem]>;
+                               FeatureSlowBTMem, FeatureFastUAMem]>;
 // "Arrandale" along with corei3 and corei5
 def : ProcessorModel<"corei7", SandyBridgeModel,
                      [FeatureSSE42, FeatureCMPXCHG16B, FeatureSlowBTMem,
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