Make incremental marking clear ICs.

src/frames.cc

 // Copyright 2012 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 771 matching lines @@
             Handle<Script> script(Script::cast(maybe_script));
             int line = GetScriptLineNumberSafe(script, source_pos) + 1;
             Object* script_name_raw = script->name();
             if (script_name_raw->IsString()) {
               String* script_name = String::cast(script->name());
               SmartArrayPointer<char> c_script_name =
                   script_name->ToCString(DISALLOW_NULLS,
                                          ROBUST_STRING_TRAVERSAL);
               PrintF(file, " at %s:%d", *c_script_name, line);
             } else {
-              PrintF(file, "at <unknown>:%d", line);
+              PrintF(file, " at <unknown>:%d", line);
             }
           } else {
             PrintF(file, " at <unknown>:<unknown>");
           }
         }
       } else {
         PrintF("<unknown>");
       }
 
       if (print_args) {
@@ skipping 633 matching lines @@
   ZoneList<StackFrame*> list(10, zone);
   for (StackFrameIterator it; !it.done(); it.Advance()) {
     StackFrame* frame = AllocateFrameCopy(it.frame(), zone);
     list.Add(frame, zone);
   }
   return list.ToVector();
 }
 
 
 } }  // namespace v8::internal