Add some support for the code-point code-unit distinction.

sdk/lib/_internal/compiler/implementation/tree/dartstring.dart

Index: sdk/lib/_internal/compiler/implementation/tree/dartstring.dart
diff --git a/sdk/lib/_internal/compiler/implementation/tree/dartstring.dart b/sdk/lib/_internal/compiler/implementation/tree/dartstring.dart
index 08ed05ac67967bddb1daf5b18a924bd05a8241f2..2efed24e16db3210beca7d18768fb6d1e6ef84cf 100644
--- a/sdk/lib/_internal/compiler/implementation/tree/dartstring.dart
+++ b/sdk/lib/_internal/compiler/implementation/tree/dartstring.dart
@@ -99,7 +99,8 @@ class EscapedSourceDartString extends SourceBasedDartString {
     StringBuffer buffer = new StringBuffer();
     StringEscapeIterator it = new StringEscapeIterator(source);
     while (it.hasNext) {
-      buffer.addCharCode(it.next());
+      int code = it.next();

[floitsch, 2012/11/08 15:28:21]

leave as is?

[erikcorry, 2012/11/15 13:28:25]

Done.

+      buffer.addCharCode(code);
     }
     toStringCache = buffer.toString();
     return toStringCache;