Support intercepted getters, setters and index operations.

pkg/compiler/lib/src/js_backend/codegen/task.dart

Index: pkg/compiler/lib/src/js_backend/codegen/task.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/task.dart b/pkg/compiler/lib/src/js_backend/codegen/task.dart
index 0068a2178f857b7e4829f1240591b2674e179e70..76b04093990bfd9a4723830e20a99e1d8bbab780 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/task.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/task.dart
@@ -62,8 +62,10 @@ class CspFunctionCompiler implements FunctionCompiler {
   js.Fun compile(CodegenWorkItem work) {
     types = new TypeMaskSystem(compiler);
     AstElement element = work.element;
+    JavaScriptBackend backend = compiler.backend;
     return compiler.withCurrentElement(element, () {
-      if (element.library.isPlatformLibrary) {
+      if (element.library.isPlatformLibrary ||
+          element.library == backend.interceptorsLibrary) {
         compiler.log('Using SSA compiler for platform element $element');
         return fallbackCompiler.compile(work);
       }