Port r7868 (constant masking) to x64.

test/cctest/test-compiler.cc

 // 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 388 matching lines @@
   disasm::Disassembler d(name_converter);
 
   if (f->code()->kind() == Code::FUNCTION) {
     Address pc = f->code()->instruction_start();
     int decode_size =
         Min(f->code()->instruction_size(),
             static_cast<int>(f->code()->stack_check_table_offset()));
     Address end = pc + decode_size;
 
     v8::internal::EmbeddedVector<char, 128> decode_buffer;
+    v8::internal::EmbeddedVector<char, 128> smi_hex_buffer;
+    Smi* smi = Smi::FromInt(12345678);
+    OS::SNPrintF(smi_hex_buffer, "0x%lx", reinterpret_cast<intptr_t>(smi));
     while (pc < end) {
       int num_const = d.ConstantPoolSizeAt(pc);
       if (num_const >= 0) {
         pc += (num_const + 1) * kPointerSize;
       } else {
         pc += d.InstructionDecode(decode_buffer, pc);
-        CHECK(strstr(decode_buffer.start(), "mov eax,0x178c29c") == NULL);
-        CHECK(strstr(decode_buffer.start(), "push 0x178c29c") == NULL);
-        CHECK(strstr(decode_buffer.start(), "0x178c29c") == NULL);
+        CHECK(strstr(decode_buffer.start(), smi_hex_buffer.start()) == NULL);
       }
     }
   }
 }
 
 
 TEST(SplitConstantsInFullCompiler) {
   v8::HandleScope scope;
   LocalContext env;
 
   CompileRun("function f() { a = 12345678 }; f();");
   CheckCodeForUnsafeLiteral(GetJSFunction(env->Global(), "f"));
   CompileRun("function f(x) { a = 12345678 + x}; f(1);");
   CheckCodeForUnsafeLiteral(GetJSFunction(env->Global(), "f"));
   CompileRun("function f(x) { var arguments = 1; x += 12345678}; f(1);");
   CheckCodeForUnsafeLiteral(GetJSFunction(env->Global(), "f"));
   CompileRun("function f(x) { var arguments = 1; x = 12345678}; f(1);");
   CheckCodeForUnsafeLiteral(GetJSFunction(env->Global(), "f"));
 }
 #endif