Start new design for interceptors and implement String.charCodeAt with it.

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

Index: sdk/lib/_internal/compiler/implementation/compile_time_constants.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/compile_time_constants.dart	(revision 14732)
+++ sdk/lib/_internal/compiler/implementation/compile_time_constants.dart	(working copy)
@@ -350,6 +350,8 @@
   }
 
   Constant visitLiteralString(LiteralString node) {
+    compiler.enqueuer.codegen.registerSpecialInstantiatedClass(
+        compiler.jsStringClass);

[ahe, 2012/11/09 13:45:29]

Looks like a good candidate for a small shared method.

[ngeoffray, 2012/11/13 11:45:16]

Done.

     return constantSystem.createString(node.dartString, node);
   }
 
@@ -357,6 +359,8 @@
     StringConstant left = evaluate(node.first);
     StringConstant right = evaluate(node.second);
     if (left == null || right == null) return null;
+    compiler.enqueuer.codegen.registerSpecialInstantiatedClass(
+        compiler.jsStringClass);
     return constantSystem.createString(
         new DartString.concat(left.value, right.value), node);
   }
@@ -364,6 +368,8 @@
   Constant visitStringInterpolation(StringInterpolation node) {
     StringConstant initialString = evaluate(node.string);
     if (initialString == null) return null;
+    compiler.enqueuer.codegen.registerSpecialInstantiatedClass(
+        compiler.jsStringClass);
     DartString accumulator = initialString.value;
     for (StringInterpolationPart part in node.parts) {
       Constant expression = evaluate(part.expression);