Fix multi-isolate build:

src/code-stubs.cc

 // Copyright 2006-2008 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 77 matching lines @@
 
 Handle<Code> CodeStub::GetCode() {
   Isolate* isolate = Isolate::Current();
   Factory* factory = isolate->factory();
   Heap* heap = isolate->heap();
   Code* code;
   if (!FindCodeInCache(&code)) {
     HandleScope scope(isolate);
 
     // Generate the new code.
-    MacroAssembler masm(NULL, 256);
+    MacroAssembler masm(isolate, NULL, 256);
     GenerateCode(&masm);
 
     // Create the code object.
     CodeDesc desc;
     masm.GetCode(&desc);
 
     // Copy the generated code into a heap object.
     Code::Flags flags = Code::ComputeFlags(
         static_cast<Code::Kind>(GetCodeKind()),
         InLoop(),
@@ skipping 16 matching lines @@
 
   ASSERT(!NeedsImmovableCode() || heap->lo_space()->Contains(code));
   return Handle<Code>(code, isolate);
 }
 
 
 MaybeObject* CodeStub::TryGetCode() {
   Code* code;
   if (!FindCodeInCache(&code)) {
     // Generate the new code.
-    MacroAssembler masm(NULL, 256);
+    MacroAssembler masm(Isolate::Current(), NULL, 256);
     GenerateCode(&masm);
     Heap* heap = masm.isolate()->heap();
 
     // Create the code object.
     CodeDesc desc;
     masm.GetCode(&desc);
 
     // Try to copy the generated code into a heap object.
     Code::Flags flags = Code::ComputeFlags(
         static_cast<Code::Kind>(GetCodeKind()),
@@ skipping 85 matching lines @@
   OS::SNPrintF(Vector<char>(name_, kMaxNameLength),
                "InstanceofStub%s%s%s",
                args,
                inline_check,
                return_true_false_object);
   return name_;
 }
 
 
 } }  // namespace v8::internal