Fix multi-isolate build:

src/codegen.cc

 // Copyright 2010 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 230 matching lines @@
     int len = String::cast(script->source())->length();
     Counters* counters = info->isolate()->counters();
     counters->total_old_codegen_source_size()->Increment(len);
   }
   if (FLAG_trace_codegen) {
     PrintF("Classic Compiler - ");
   }
   MakeCodePrologue(info);
   // Generate code.
   const int kInitialBufferSize = 4 * KB;
-  MacroAssembler masm(NULL, kInitialBufferSize);
+  MacroAssembler masm(info->isolate(), NULL, kInitialBufferSize);
 #ifdef ENABLE_GDB_JIT_INTERFACE
   masm.positions_recorder()->StartGDBJITLineInfoRecording();
 #endif
   CodeGenerator cgen(&masm);
   CodeGeneratorScope scope(Isolate::Current(), &cgen);
   cgen.Generate(info);
   if (cgen.HasStackOverflow()) {
     ASSERT(!Isolate::Current()->has_pending_exception());
     return false;
   }
@@ skipping 234 matching lines @@
   int result = save_doubles_ ? 1 : 0;
 #ifdef _WIN64
   return result | ((result_size_ == 1) ? 0 : 2);
 #else
   return result;
 #endif
 }
 
 
 } }  // namespace v8::internal