Make whether or not a Code object should be created by masm explicit

test/cctest/test-code-stubs-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Rrdistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Rrdistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Rrdistributions 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 36 matching lines @@
 
 ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
                                               Register source_reg,
                                               Register destination_reg) {
   // Allocate an executable page of memory.
   size_t actual_size;
   byte* buffer = static_cast<byte*>(v8::base::OS::Allocate(
       Assembler::kMinimalBufferSize, &actual_size, true));
   CHECK(buffer);
   HandleScope handles(isolate);
-  MacroAssembler assm(isolate, buffer, static_cast<int>(actual_size));
+  MacroAssembler assm(isolate, buffer, static_cast<int>(actual_size), true);
   int offset =
     source_reg.is(rsp) ? 0 : (HeapNumber::kValueOffset - kSmiTagSize);
   DoubleToIStub stub(isolate, source_reg, destination_reg, offset, true);
   byte* start = stub.GetCode()->instruction_start();
 
   __ pushq(rbx);
   __ pushq(rcx);
   __ pushq(rdx);
   __ pushq(rsi);
   __ pushq(rdi);
@@ skipping 84 matching lines @@
 
   for (size_t s = 0; s < sizeof(source_registers) / sizeof(Register); s++) {
     for (size_t d = 0; d < sizeof(dest_registers) / sizeof(Register); d++) {
       RunAllTruncationTests(
           MakeConvertDToIFuncTrampoline(isolate,
                                         source_registers[s],
                                         dest_registers[d]));
     }
   }
 }