Correctly escape RegExp source.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 867deb9352106b3122fdf4ec44c2927d74bd0cc3..b9b6f41edc4ca06c1b0a3bd7e79e66077766d98f 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -8289,6 +8289,22 @@ String::FlatContent String::GetFlatContent() {
 }
 
 
+template <>
+Vector<const uint8_t> String::GetCharVector() {
+  String::FlatContent flat = GetFlatContent();
+  DCHECK(flat.IsOneByte());
+  return flat.ToOneByteVector();
+}
+
+
+template <>
+Vector<const uc16> String::GetCharVector() {
+  String::FlatContent flat = GetFlatContent();
+  DCHECK(flat.IsTwoByte());
+  return flat.ToUC16Vector();
+}
+
+
 SmartArrayPointer<char> String::ToCString(AllowNullsFlag allow_nulls,
                                           RobustnessFlag robust_flag,
                                           int offset,