Fix a few clang warnings (which -Werror treats as errors)

src/jsregexp.h

 // Copyright 2006-2008 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 1053 matching lines @@
                                     bool not_at_start);
   virtual ChoiceNode* Clone() { return new ChoiceNode(*this); }
 
   bool being_calculated() { return being_calculated_; }
   bool not_at_start() { return not_at_start_; }
   void set_not_at_start() { not_at_start_ = true; }
   void set_being_calculated(bool b) { being_calculated_ = b; }
   virtual bool try_to_emit_quick_check_for_alternative(int i) { return true; }
 
  protected:
-  int GreedyLoopTextLength(GuardedAlternative* alternative);
+  int GreedyLoopTextLengthForAlternative(GuardedAlternative* alternative);
   ZoneList<GuardedAlternative>* alternatives_;
 
  private:
   friend class DispatchTableConstructor;
   friend class Analysis;
   void GenerateGuard(RegExpMacroAssembler* macro_assembler,
                      Guard* guard,
                      Trace* trace);
   int CalculatePreloadCharacters(RegExpCompiler* compiler, bool not_at_start);
   void EmitOutOfLineContinuation(RegExpCompiler* compiler,
@@ skipping 397 matching lines @@
   int* vector_;
   int offsets_vector_length_;
 
   friend class ExternalReference;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSREGEXP_H_