dart2js cps: Remove interceptors in cases where type propagation fails.

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 6e0619bc044ae3a8c74d8fc0dcd3058f30cb63c1..a17f31fcf54cf7e307e4ff97578a0d8043c151d0 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/task.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/task.dart
@@ -274,7 +274,7 @@ class CpsFunctionCompiler implements FunctionCompiler {
       applyCpsPass(new ShrinkingReducer(), cpsFunction);
       applyCpsPass(new EagerlyLoadStatics(), cpsFunction);
       applyCpsPass(new GVN(compiler, typeSystem), cpsFunction);
-      applyCpsPass(new DuplicateBranchEliminator(), cpsFunction);
+      applyCpsPass(new PathBasedOptimizer(backend, typeSystem), cpsFunction);
       applyCpsPass(new ShrinkingReducer(), cpsFunction);
       applyCpsPass(new UpdateRefinements(typeSystem), cpsFunction);
       applyCpsPass(new BoundsChecker(typeSystem, compiler.world), cpsFunction);