Implement memory operands for instructions in the x64 assembler.

test/cctest/test-assembler-x64.cc

 // Copyright 2009 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 135 matching lines @@
                                                  true));
   CHECK(buffer);
   Assembler assm(buffer, actual_size);
 
   // Assemble a simple function that copies argument 2 and returns it.
   __ push(rbp);
   __ mov(rbp, rsp);
   __ push(rsi);  // Value at (rbp - 8)
   __ push(rsi);  // Value at (rbp - 16)
   __ push(rdi);  // Value at (rbp - 24)
-  // const int kStackElementSize = 8;
-  //  __ mov(rax, Operand(rbp,-3 * kStackElementSize));
-  __ pop(rax);
-  __ pop(rax);
-  __ pop(rax);
+  const int kStackElementSize = 8;
+  __ mov(rax, Operand(rbp, -3 * kStackElementSize));
+  __ pop(rsi);
+  __ pop(rsi);
+  __ pop(rsi);
   __ pop(rbp);
   __ nop();
   __ ret(0);
 
   CodeDesc desc;
   assm.GetCode(&desc);
   // Call the function from C++.
   int result =  FUNCTION_CAST<F2>(buffer)(3, 2);
-  CHECK_EQ(2, result);
+  CHECK_EQ(3, result);
 }
 
 TEST(AssemblerX64ControlFlow) {
   // Allocate an executable page of memory.
   size_t actual_size;
   byte* buffer = static_cast<byte*>(OS::Allocate(Assembler::kMinimalBufferSize,
                                                  &actual_size,
                                                  true));
   CHECK(buffer);
   Assembler assm(buffer, actual_size);
@@ skipping 10 matching lines @@
   __ ret(0);
 
   CodeDesc desc;
   assm.GetCode(&desc);
   // Call the function from C++.
   int result =  FUNCTION_CAST<F2>(buffer)(3, 2);
   CHECK_EQ(3, result);
 }
 
 #undef __