Introduce code flushing of RegExp code.

src/objects-visiting.h

Index: src/objects-visiting.h
===================================================================
--- src/objects-visiting.h	(revision 8501)
+++ src/objects-visiting.h	(working copy)
@@ -105,6 +105,7 @@
     kVisitPropertyCell,
     kVisitSharedFunctionInfo,
     kVisitJSFunction,
+    kVisitJSRegExp,
 
     kVisitorIdCount,
     kMinObjectSizeInWords = 2
@@ -300,6 +301,8 @@
                                       SharedFunctionInfo::BodyDescriptor,
                                       int>::Visit);
 
+    table_.Register(kVisitJSRegExp, &VisitJSRegExp);
+
     table_.Register(kVisitSeqAsciiString, &VisitSeqAsciiString);
 
     table_.Register(kVisitSeqTwoByteString, &VisitSeqTwoByteString);
@@ -342,6 +345,10 @@
         SeqAsciiStringSize(map->instance_type());
   }
 
+  static inline int VisitJSRegExp(Map* map, HeapObject* object) {
+    return JSObjectVisitor::Visit(map, object);
+  }
+
   static inline int VisitSeqTwoByteString(Map* map, HeapObject* object) {
     return SeqTwoByteString::cast(object)->
         SeqTwoByteStringSize(map->instance_type());