Fix raw pointer misuse in StringReplaceRegExpWithEmptyString.

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 2695 matching lines @@
   int start, end;
   {
     AssertNoAllocation match_info_array_is_not_in_a_handle;
     FixedArray* match_info_array =
         FixedArray::cast(last_match_info_handle->elements());
 
     start = RegExpImpl::GetCapture(match_info_array, 0);
     end = RegExpImpl::GetCapture(match_info_array, 1);
   }
 
-  int length = subject->length();
+  int length = subject_handle->length();
   int new_length = length - (end - start);
   if (new_length == 0) {
     return isolate->heap()->empty_string();
   }
   Handle<ResultSeqString> answer;
   if (ResultSeqString::kHasAsciiEncoding) {
     answer = Handle<ResultSeqString>::cast(
         isolate->factory()->NewRawAsciiString(new_length));
   } else {
     answer = Handle<ResultSeqString>::cast(
@@ skipping 9258 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(false);
   }
 }
 
 
 } }  // namespace v8::internal