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

src/x64/macro-assembler-x64.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_X64_MACRO_ASSEMBLER_X64_H_
 #define V8_X64_MACRO_ASSEMBLER_X64_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 904 matching lines @@
     // Opcode: REX_opt FF /2 m64
     return (target.requires_rex() ? 2 : 1) + target.operand_size();
   }
 
   // Emit call to the code we are currently generating.
   void CallSelf() {
     Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location()));
     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
   // (kScratchRegister, kRootRegister).
   void Pushad();
   void Popad();
   // Sets the stack as after performing Popad, without actually loading the
   // registers.
   void Dropad();
 
@@ skipping 679 matching lines @@
     masm->popfq();                                                           \
   }                                                                          \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_