Fix Chromium issue 47824.

src/regexp-macro-assembler.cc

 // Copyright 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 102 matching lines @@
 
   // No allocations before calling the regexp, but we can't use
   // AssertNoAllocation, since regexps might be preempted, and another thread
   // might do allocation anyway.
 
   String* subject_ptr = *subject;
   // Character offsets into string.
   int start_offset = previous_index;
   int end_offset = subject_ptr->length();
 
-  bool is_ascii = subject->IsAsciiRepresentation();
-
   // The string has been flattened, so it it is a cons string it contains the
   // full string in the first part.
   if (StringShape(subject_ptr).IsCons()) {
     ASSERT_EQ(0, ConsString::cast(subject_ptr)->second()->length());
     subject_ptr = ConsString::cast(subject_ptr)->first();
   }
   // Ensure that an underlying string has the same ascii-ness.
-  ASSERT(subject_ptr->IsAsciiRepresentation() == is_ascii);
+  bool is_ascii = subject_ptr->IsAsciiRepresentation();
   ASSERT(subject_ptr->IsExternalString() || subject_ptr->IsSeqString());
   // String is now either Sequential or External
   int char_size_shift = is_ascii ? 0 : 1;
   int char_length = end_offset - start_offset;
 
   const byte* input_start =
       StringCharacterPosition(subject_ptr, start_offset);
   int byte_length = char_length << char_size_shift;
   const byte* input_end = input_start + byte_length;
   Result res = Execute(*regexp_code,
@@ skipping 111 matching lines @@
     return NULL;
   }
   *stack_base = new_stack_base;
   intptr_t stack_content_size = old_stack_base - stack_pointer;
   return new_stack_base - stack_content_size;
 }
 
 #endif  // V8_INTERPRETED_REGEXP
 
 } }  // namespace v8::internal