Add fast 64-bit bitwise negation to the IA32 optimizing compiler.

runtime/vm/assembler_ia32.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_ASSEMBLER_IA32_H_
 #define VM_ASSEMBLER_IA32_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_ia32.h directly; use assembler.h instead.
 #endif
@@ skipping 380 matching lines @@
 
   void andpd(XmmRegister dst, const Address& src);
   void andpd(XmmRegister dst, XmmRegister src);
 
   void orpd(XmmRegister dst, XmmRegister src);
 
   void pextrd(Register dst, XmmRegister src, const Immediate& imm);
   void pmovsxdq(XmmRegister dst, XmmRegister src);
   void pcmpeqq(XmmRegister dst, XmmRegister src);
 
+  void pxor(XmmRegister dst, XmmRegister src);
+
   void flds(const Address& src);
   void fstps(const Address& dst);
 
   void fldl(const Address& src);
   void fstpl(const Address& dst);
 
   void fnstcw(const Address& dst);
   void fldcw(const Address& src);
 
   void fistpl(const Address& dst);
@@ skipping 279 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_IA32_H_