Introduce StackArgumentsAccessor class for X64

src/x64/macro-assembler-x64.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1505 matching lines @@
   return Operand(rsp, index * kPointerSize);
 #endif
 }
 
 
 inline Operand StackOperandForReturnAddress(int32_t disp) {
   return Operand(rsp, disp);
 }
 
 
+// Computes the argument address in reverse order, i.e., from the last argument
+// at rsp + kPCOnStackSize.
+inline Operand StackOperandForReversedArgument(int index) {
+  return Operand(rsp, kPCOnStackSize + index * kPointerSize);
+}
+
+
+// Computes the argument address in reverse order, i.e., from the last argument
+// at rsp + kPCOnStackSize.
+inline Operand StackOperandForReversedArgument(Register index, int offset) {
+  return Operand(rsp, index, times_pointer_size,
+                 kPCOnStackSize + offset * kPointerSize);
+}
+
+
+inline Operand StackOperandForReceiver(int index) {
+  return StackOperandForReversedArgument(index);
+}
+
+
+inline Operand StackOperandForReceiver(Register index) {
+  return StackOperandForReversedArgument(index, 0);
+}
+
+
 #ifdef GENERATED_CODE_COVERAGE
 extern void LogGeneratedCodeCoverage(const char* file_line);
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) {                                                  \
     Address x64_coverage_function = FUNCTION_ADDR(LogGeneratedCodeCoverage); \
     masm->pushfq();                                                          \
     masm->Pushad();                                                          \
     masm->push(Immediate(reinterpret_cast<int>(&__FILE_LINE__)));            \
     masm->Call(x64_coverage_function, RelocInfo::EXTERNAL_REFERENCE);        \
     masm->pop(rax);                                                          \
     masm->Popad();                                                           \
     masm->popfq();                                                           \
   }                                                                          \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_