[Interpreter] Add ForInPrepare runtime function which returns a ObjectTriple.

src/ia32/macro-assembler-ia32.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_IA32_MACRO_ASSEMBLER_IA32_H_
 #define V8_IA32_MACRO_ASSEMBLER_IA32_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
 #include "src/globals.h"
 
 namespace v8 {
 namespace internal {
 
 // Give alias names to registers for calling conventions.
 const Register kReturnRegister0 = {Register::kCode_eax};
 const Register kReturnRegister1 = {Register::kCode_edx};
+const Register kReturnRegister2 = {Register::kCode_edi};
 const Register kJSFunctionRegister = {Register::kCode_edi};
 const Register kContextRegister = {Register::kCode_esi};
 const Register kInterpreterAccumulatorRegister = {Register::kCode_eax};
 const Register kInterpreterRegisterFileRegister = {Register::kCode_edx};
 const Register kInterpreterBytecodeOffsetRegister = {Register::kCode_ecx};
 const Register kInterpreterBytecodeArrayRegister = {Register::kCode_edi};
 const Register kJavaScriptCallArgCountRegister = {Register::kCode_eax};
 const Register kJavaScriptCallNewTargetRegister = {Register::kCode_edx};
 const Register kRuntimeCallFunctionRegister = {Register::kCode_ebx};
 const Register kRuntimeCallArgCountRegister = {Register::kCode_eax};
@@ skipping 189 matching lines @@
   void DebugBreak();
 
   // Generates function and stub prologue code.
   void StubPrologue();
   void Prologue(bool code_pre_aging);
 
   // Enter specific kind of exit frame. Expects the number of
   // arguments in register eax and sets up the number of arguments in
   // register edi and the pointer to the first argument in register
   // esi.
-  void EnterExitFrame(bool save_doubles);
+  void EnterExitFrame(int argc, bool save_doubles);
 
   void EnterApiExitFrame(int argc);
 
   // Leave the current exit frame. Expects the return value in
   // register eax:edx (untouched) and the pointer to the first
   // argument in register esi (if pop_arguments == true).
   void LeaveExitFrame(bool save_doubles, bool pop_arguments = true);
 
   // Leave the current exit frame. Expects the return value in
   // register eax (untouched).
@@ skipping 771 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_IA32_MACRO_ASSEMBLER_IA32_H_