Use a random seed for the string hash algorithm.

src/heap.h

 // 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 936 matching lines @@
   // the provided data as the relocation information.
   MUST_USE_RESULT MaybeObject* CopyCode(Code* code, Vector<byte> reloc_info);
 
   // Finds the symbol for string in the symbol table.
   // If not found, a new symbol is added to the table and returned.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if allocation
   // failed.
   // Please note this function does not perform a garbage collection.
   MUST_USE_RESULT MaybeObject* LookupSymbol(Vector<const char> str);
   MUST_USE_RESULT MaybeObject* LookupAsciiSymbol(Vector<const char> str);
-  MUST_USE_RESULT MaybeObject* LookupTwoByteSymbol(
-      Vector<const uc16> str);
+  MUST_USE_RESULT MaybeObject* LookupTwoByteSymbol(Vector<const uc16> str);
   MUST_USE_RESULT MaybeObject* LookupAsciiSymbol(const char* str) {
     return LookupSymbol(CStrVector(str));
   }
   MUST_USE_RESULT MaybeObject* LookupSymbol(String* str);
   MUST_USE_RESULT MaybeObject* LookupAsciiSymbol(Handle<SeqAsciiString> string,
                                                  int from,
                                                  int length);
 
   bool LookupSymbolIfExists(String* str, String** symbol);
   bool LookupTwoCharsSymbolIfExists(String* str, String** symbol);
@@ skipping 1635 matching lines @@
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 } }  // namespace v8::internal
 
 #undef HEAP
 
 #endif  // V8_HEAP_H_