Don't compare the hash in AstRawStringCompare since it's guaranteed by the HashMap implementation

src/ast/ast-value-factory.cc

 // Copyright 2014 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 379 matching lines @@
     }
     entry->value = reinterpret_cast<void*>(1);
   }
   return reinterpret_cast<AstRawString*>(entry->key);
 }
 
 
 bool AstValueFactory::AstRawStringCompare(void* a, void* b) {
   const AstRawString* lhs = static_cast<AstRawString*>(a);
   const AstRawString* rhs = static_cast<AstRawString*>(b);
+  DCHECK_EQ(lhs->hash(), rhs->hash());
   if (lhs->length() != rhs->length()) return false;
-  if (lhs->hash() != rhs->hash()) return false;
   const unsigned char* l = lhs->raw_data();
   const unsigned char* r = rhs->raw_data();
   size_t length = rhs->length();
   if (lhs->is_one_byte()) {
     if (rhs->is_one_byte()) {
       return CompareCharsUnsigned(reinterpret_cast<const uint8_t*>(l),
                                   reinterpret_cast<const uint8_t*>(r),
                                   length) == 0;
     } else {
       return CompareCharsUnsigned(reinterpret_cast<const uint8_t*>(l),
                                   reinterpret_cast<const uint16_t*>(r),
                                   length) == 0;
     }
   } else {
     if (rhs->is_one_byte()) {
       return CompareCharsUnsigned(reinterpret_cast<const uint16_t*>(l),
                                   reinterpret_cast<const uint8_t*>(r),
                                   length) == 0;
     } else {
       return CompareCharsUnsigned(reinterpret_cast<const uint16_t*>(l),
                                   reinterpret_cast<const uint16_t*>(r),
                                   length) == 0;
     }
   }
 }
 }  // namespace internal
 }  // namespace v8