Dart2js CPS: Implement 'await for'.

pkg/compiler/lib/src/cps_ir/cps_ir_builder.dart

Index: pkg/compiler/lib/src/cps_ir/cps_ir_builder.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_builder.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_builder.dart
index 470a96d14c1e53abe1a1d0d67cc890a556e4206b..77d4f0cecebc20519fc9a61a87c63ce7740e3222 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_builder.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_builder.dart
@@ -1401,8 +1401,8 @@ class IrBuilder {
       Selector selector = new Selector.setter(
           new Name(variableElement.name, variableElement.library));
       List<ir.Primitive> value = <ir.Primitive>[currentValue];
-      // Note the order of the comparisons below.  It can be the case that an
-      // element isError and isMalformed.
+      // Note the comparison below.  It can be the case that an element isError
+      // and isMalformed.
       if (Elements.isError(variableElement)) {
         bodyBuilder.buildStaticNoSuchMethod(selector, value);
       } else {