Correctly escape RegExp source.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index a86253d5a5b62c82244007dc44426faf28e7bb6b..ab8a351e7e388dbbb7a2afd978413bbc1a13e36f 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7930,12 +7930,11 @@ class JSRegExp: public JSObject {
       FixedArray::kHeaderSize + kIrregexpCaptureCountIndex * kPointerSize;
 
   // In-object fields.
-  static const int kSourceFieldIndex = 0;
-  static const int kGlobalFieldIndex = 1;
-  static const int kIgnoreCaseFieldIndex = 2;
-  static const int kMultilineFieldIndex = 3;
-  static const int kLastIndexFieldIndex = 4;
-  static const int kInObjectFieldCount = 5;
+  static const int kGlobalFieldIndex = 0;
+  static const int kIgnoreCaseFieldIndex = 1;
+  static const int kMultilineFieldIndex = 2;
+  static const int kLastIndexFieldIndex = 3;
+  static const int kInObjectFieldCount = 4;
 
   // The uninitialized value for a regexp code object.
   static const int kUninitializedValue = -1;
@@ -8816,6 +8815,9 @@ class String: public Name {
     friend class String;
   };
 
+  template <typename Char>
+  Vector<const Char> GetCharVector();
+
   // Get and set the length of the string.
   inline int length() const;
   inline void set_length(int value);