Fix regression caused by the generation of a shift stub during...

src/x64/codegen-x64.h

Index: src/x64/codegen-x64.h
===================================================================
--- src/x64/codegen-x64.h	(revision 2704)
+++ src/x64/codegen-x64.h	(working copy)
@@ -619,6 +619,7 @@
                       OverwriteMode mode,
                       GenericBinaryFlags flags)
       : op_(op), mode_(mode), flags_(flags) {
+    use_sse3_ = CpuFeatures::IsSupported(CpuFeatures::SSE3);
     ASSERT(OpBits::is_valid(Token::NUM_TOKENS));
   }
 
@@ -628,6 +629,7 @@
   Token::Value op_;
   OverwriteMode mode_;
   GenericBinaryFlags flags_;
+  bool use_sse3_;
 
   const char* GetName();
 
@@ -640,17 +642,19 @@
   }
 #endif
 
-  // Minor key encoding in 16 bits FOOOOOOOOOOOOOMM.
+  // Minor key encoding in 16 bits FSOOOOOOOOOOOOMM.
   class ModeBits: public BitField<OverwriteMode, 0, 2> {};
-  class OpBits: public BitField<Token::Value, 2, 13> {};
+  class OpBits: public BitField<Token::Value, 2, 12> {};
+  class SSE3Bits: public BitField<bool, 14, 1> {};
   class FlagBits: public BitField<GenericBinaryFlags, 15, 1> {};
 
   Major MajorKey() { return GenericBinaryOp; }
   int MinorKey() {
     // Encode the parameters in a unique 16 bit value.
     return OpBits::encode(op_)
-           | ModeBits::encode(mode_)
-           | FlagBits::encode(flags_);
+        | ModeBits::encode(mode_)
+        | FlagBits::encode(flags_)
+        | SSE3Bits::encode(use_sse3_);
   }
   void Generate(MacroAssembler* masm);
 };