Fix use of non-gc safe pointer in regexp code.

src/runtime.cc

 // Copyright 2011 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 2935 matching lines @@
   ZoneScope zone(isolate, DELETE_ON_EXIT);
   CompiledReplacement compiled_replacement;
   compiled_replacement.Compile(replacement_handle,
                                capture_count,
                                length);
 
   bool is_global = regexp_handle->GetFlags().is_global();
 
   // Shortcut for simple non-regexp global replacements
   if (is_global &&
-      regexp->TypeTag() == JSRegExp::ATOM &&
+      regexp_handle->TypeTag() == JSRegExp::ATOM &&
       compiled_replacement.simple_hint()) {
     if (subject_handle->HasOnlyAsciiChars() &&
         replacement_handle->HasOnlyAsciiChars()) {
       return StringReplaceStringWithString<SeqAsciiString>(
           isolate, subject_handle, regexp_handle, replacement_handle);
     } else {
       return StringReplaceStringWithString<SeqTwoByteString>(
           isolate, subject_handle, regexp_handle, replacement_handle);
     }
   }
@@ skipping 10250 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags);
   }
 }
 
 
 } }  // namespace v8::internal