Replace OS::MemCopy with OS::MemMove (just as fast but more flexible).

src/ia32/assembler-ia32.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 1008 matching lines @@
 
   void cmpltsd(XMMRegister dst, XMMRegister src);
   void pcmpeqd(XMMRegister dst, XMMRegister src);
 
   void movaps(XMMRegister dst, XMMRegister src);
 
   void movdqa(XMMRegister dst, const Operand& src);
   void movdqa(const Operand& dst, XMMRegister src);
   void movdqu(XMMRegister dst, const Operand& src);
   void movdqu(const Operand& dst, XMMRegister src);
+  void movdq(bool aligned, XMMRegister dst, const Operand& src) {
+    if (aligned) {
+      movdqa(dst, src);
+    } else {
+      movdqu(dst, src);
+    }
+  }
 
   // Use either movsd or movlpd.
   void movdbl(XMMRegister dst, const Operand& src);
   void movdbl(const Operand& dst, XMMRegister src);
 
   void movd(XMMRegister dst, Register src) { movd(dst, Operand(src)); }
   void movd(XMMRegister dst, const Operand& src);
   void movd(Register dst, XMMRegister src) { movd(Operand(dst), src); }
   void movd(const Operand& dst, XMMRegister src);
   void movsd(XMMRegister dst, XMMRegister src);
@@ skipping 169 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_ASSEMBLER_IA32_H_