X87: [Interpreter] Add ForInPrepare runtime function which returns a ObjectTriple.

src/x87/macro-assembler-x87.h

Index: src/x87/macro-assembler-x87.h
diff --git a/src/x87/macro-assembler-x87.h b/src/x87/macro-assembler-x87.h
index 9b6c5e8a0ab80e16486a539c1506243a1117b496..3f3b41d4f92d4cec951ec04f5b5055c0d24dacc9 100644
--- a/src/x87/macro-assembler-x87.h
+++ b/src/x87/macro-assembler-x87.h
@@ -16,6 +16,7 @@ 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};
@@ -225,7 +226,7 @@ class MacroAssembler: public Assembler {
   // 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);