Add a getter interceptor to the new interceptor scheme. Also cleanup the "this" that turns into a r…

sdk/lib/_internal/compiler/implementation/lib/interceptors.dart

Index: sdk/lib/_internal/compiler/implementation/lib/interceptors.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/lib/interceptors.dart	(revision 14875)
+++ sdk/lib/_internal/compiler/implementation/lib/interceptors.dart	(working copy)
@@ -21,6 +21,14 @@
     if (index >= length) throw new RangeError.value(index);
     return JS('int', r'#.charCodeAt(#)', this, index);
   }
+
+  List<int> get charCodes  {
+    List<int> result = new List<int>(length);
+    for (int i = 0; i < length; i++) {
+      result[i] = charCodeAt(i);
+    }
+    return result;
+  }
 }
 
 /**
@@ -670,16 +678,6 @@
   return 0x1fffffff & (hash + (0x00003fff & hash) << 15);
 }
 
-get$charCodes(receiver) {
-  if (receiver is !String) return UNINTERCEPTED(receiver.charCodes);
-  int len = receiver.length;
-  List<int> result = new List<int>(len);
-  for (int i = 0; i < len; i++) {
-    result[i] = receiver.charCodeAt(i);
-  }
-  return result;
-}
-
 get$isEven(receiver) {
   if (receiver is !int) return UNINTERCEPTED(receiver.isEven);
   return (receiver & 1) == 0;