[compiler] Delay allocation of code-embedded heap numbers.

test/cctest/test-macro-assembler-ia32.cc

 // Copyright 2013 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 134 matching lines @@
   __ j(not_equal, &exit);
 
   __ xor_(eax, eax);  // Success.
   __ bind(&exit);
   __ add(esp, Immediate(1 * kPointerSize));
   __ pop(edx);
   __ pop(ebx);
   __ ret(0);
 
   CodeDesc desc;
-  masm->GetCode(&desc);
+  masm->GetCode(isolate, &desc);
   // Call the function from C++.
   int result = FUNCTION_CAST<F0>(buffer)();
   CHECK_EQ(0, result);
 }
 
 #undef __