Change scanner buffers to not use utf-8.

src/objects.h

 // Copyright 2010 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 2309 matching lines @@
 //
 // No special elements in the prefix and the element size is 1
 // because only the symbol itself (the key) needs to be stored.
 class SymbolTable: public HashTable<SymbolTableShape, HashTableKey*> {
  public:
   // Find symbol in the symbol table.  If it is not there yet, it is
   // added.  The return value is the symbol table which might have
   // been enlarged.  If the return value is not a failure, the symbol
   // pointer *s is set to the symbol found.
   MUST_USE_RESULT MaybeObject* LookupSymbol(Vector<const char> str, Object** s);
+  MUST_USE_RESULT MaybeObject* LookupAsciiSymbol(Vector<const char> str,
+                                                 Object** s);
+  MUST_USE_RESULT MaybeObject* LookupTwoByteSymbol(Vector<const uc16> str,
+                                                   Object** s);
   MUST_USE_RESULT MaybeObject* LookupString(String* key, Object** s);
 
   // Looks up a symbol that is equal to the given string and returns
   // true if it is found, assigning the symbol to the given output
   // parameter.
   bool LookupSymbolIfExists(String* str, String** symbol);
   bool LookupTwoCharsSymbolIfExists(uint32_t c1, uint32_t c2, String** symbol);
 
   // Casting.
   static inline SymbolTable* cast(Object* obj);
@@ skipping 2727 matching lines @@
   bool MarkAsUndetectable();
 
   // Return a substring.
   MUST_USE_RESULT MaybeObject* SubString(int from,
                                          int to,
                                          PretenureFlag pretenure = NOT_TENURED);
 
   // String equality operations.
   inline bool Equals(String* other);
   bool IsEqualTo(Vector<const char> str);
+  bool IsAsciiEqualTo(Vector<const char> str);
+  bool IsTwoByteEqualTo(Vector<const uc16> str);
 
   // Return a UTF8 representation of the string.  The string is null
   // terminated but may optionally contain nulls.  Length is returned
   // in length_output if length_output is not a null pointer  The string
   // should be nearly flat, otherwise the performance of this method may
   // be very slow (quadratic in the length).  Setting robustness_flag to
   // ROBUST_STRING_TRAVERSAL invokes behaviour that is robust  This means it
   // handles unexpected data without causing assert failures and it does not
   // do any heap allocations.  This is useful when printing stack traces.
   SmartPointer<char> ToCString(AllowNullsFlag allow_nulls,
@@ skipping 1289 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_