[turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

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 47651e2620c0b4147f9a34a2effed90cb51513e8..1eb7f6effefc7c32bbc6ae96ad6f25bb5e80c68a 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -922,6 +922,11 @@ class MacroAssembler: public Assembler {
     Call(self, RelocInfo::CODE_TARGET);
   }
 
+  // Non-SSE2 instructions.
+  void Pextrd(Register dst, XMMRegister src, int8_t imm8);
+  void Pinsrd(XMMRegister dst, Register src, int8_t imm8);
+  void Pinsrd(XMMRegister dst, const Operand& src, int8_t imm8);
+
   // Non-x64 instructions.
   // Push/pop all general purpose registers.
   // Does not push rsp/rbp nor any of the assembler's special purpose registers