Fixed lint errors caused by "runtime/references" rule and the rule itself is restored.

src/jsregexp.h

Index: src/jsregexp.h
diff --git a/src/jsregexp.h b/src/jsregexp.h
index ecb604883f5ba78343824398fa9600ce476327c2..4da8ba342c26720fd48d0fe5cc68e55d9e790355 100644
--- a/src/jsregexp.h
+++ b/src/jsregexp.h
@@ -296,7 +296,7 @@ class OutSet: public ZoneObject {
  public:
   OutSet() : first_(0), remaining_(NULL), successors_(NULL) { }
   OutSet* Extend(unsigned value, Zone* zone);
-  bool Get(unsigned value);
+  bool Get(unsigned value) const;
   static const unsigned kFirstLimit = 32;
 
  private:
@@ -1465,14 +1465,14 @@ class Trace {
   int FindAffectedRegisters(OutSet* affected_registers, Zone* zone);
   void PerformDeferredActions(RegExpMacroAssembler* macro,
                               int max_register,
-                              OutSet& affected_registers,
+                              const OutSet& affected_registers,
                               OutSet* registers_to_pop,
                               OutSet* registers_to_clear,
                               Zone* zone);
   void RestoreAffectedRegisters(RegExpMacroAssembler* macro,
                                 int max_register,
-                                OutSet& registers_to_pop,
-                                OutSet& registers_to_clear);
+                                const OutSet& registers_to_pop,
+                                const OutSet& registers_to_clear);
   int cp_offset_;
   DeferredAction* actions_;
   Label* backtrack_;