dart2js: Add support for do/while loops to the CPS backend.

pkg/compiler/lib/src/dart_backend/backend.dart

Index: pkg/compiler/lib/src/dart_backend/backend.dart
diff --git a/pkg/compiler/lib/src/dart_backend/backend.dart b/pkg/compiler/lib/src/dart_backend/backend.dart
index 73b6997279ddf13f3f1b37813e80325acf3b161d..a28e67dbb8757851b82fba773fbcd3029d19e1ad 100644
--- a/pkg/compiler/lib/src/dart_backend/backend.dart
+++ b/pkg/compiler/lib/src/dart_backend/backend.dart
@@ -160,9 +160,9 @@ class DartBackend extends Backend {
     // TODO(karlklose): enable type propagation for dart2dart when constant
     // types are correctly marked as instantiated (Issue 21880).
     applyCpsPass(new TypePropagator(context.dartTypes,
-                           context.constantSystem,
-                           new UnitTypeSystem(),
-                           context.internalError));
+                 context.constantSystem,

[Johnni Winther, 2015/03/12 12:38:07]

Indent by 4 or align with `context.dartType`.

[Kevin Millikin (Google), 2015/03/12 14:05:18]

Oops, I totally misread the indentation.  I'll clean it up.

+                 new UnitTypeSystem(),
+                 context.internalError));
     applyCpsPass(new RedundantPhiEliminator());
     applyCpsPass(new ShrinkingReducer());