Correctly escape RegExp source.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 9569de97329d9316e684448e8478d32a4377cffa..0ec38664daa5b2957d7d6de7471ff69a5def951c 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7933,12 +7933,11 @@ 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;
@@ -8819,6 +8818,9 @@ 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);