Fix multi-isolate build:

src/ia32/codegen-ia32.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 10158 matching lines @@
 
 #define __ masm.
 
 
 static void MemCopyWrapper(void* dest, const void* src, size_t size) {
   memcpy(dest, src, size);
 }
 
 
 OS::MemCopyFunction CreateMemCopyFunction() {
-  HandleScope scope;
   size_t actual_size;
   // Allocate buffer in executable space.
   byte* buffer = static_cast<byte*>(OS::Allocate(1 * KB,
                                                  &actual_size,
                                                  true));
   if (buffer == NULL) return &MemCopyWrapper;
-  MacroAssembler masm(buffer, static_cast<int>(actual_size));
+  MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size));
 
   // Generated code is put into a fixed, unmovable, buffer, and not into
   // the V8 heap. We can't, and don't, refer to any relocatable addresses
   // (e.g. the JavaScript nan-object).
 
   // 32-bit C declaration function calls pass arguments on stack.
 
   // Stack layout:
   // esp[12]: Third argument, size.
   // esp[8]: Second argument, source pointer.
@@ skipping 180 matching lines @@
 
   CPU::FlushICache(buffer, actual_size);
   return FUNCTION_CAST<OS::MemCopyFunction>(buffer);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32