[x64] Implement vpcmpeqd, vpslld, vpsrld AVX instructions.

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 29d528d817736ac4de0469fc2793f7ab198f6d97..ec1cb2ac6c7c242f11b6bb3e12078eea0e58783a 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -927,6 +927,9 @@ class MacroAssembler: public Assembler {
   void Ucomisd(XMMRegister src1, const Operand& src2);
 
   void Xorpd(XMMRegister dst, XMMRegister src);
+  void Pcmpeqd(XMMRegister dst, XMMRegister src);
+  void Psllq(XMMRegister dst, byte imm8);
+  void Psrlq(XMMRegister dst, byte imm8);
 
   // Control Flow
   void Jump(Address destination, RelocInfo::Mode rmode);