cps-ir: Set runtime type information for new objects that require it.

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

Index: pkg/compiler/lib/src/cps_ir/type_propagation.dart
diff --git a/pkg/compiler/lib/src/cps_ir/type_propagation.dart b/pkg/compiler/lib/src/cps_ir/type_propagation.dart
index bdacd015367b857e01c2152b372cbf76ea9f7d32..24ed86b4b887610d19eb2e3aa23018c9e2503356 100644
--- a/pkg/compiler/lib/src/cps_ir/type_propagation.dart
+++ b/pkg/compiler/lib/src/cps_ir/type_propagation.dart
@@ -854,6 +854,13 @@ class _TypePropagationVisitor<T> implements Visitor {
     // real constants of type [Type].
     setValue(node, nonConst());
   }
+
+  @override
+  visitTypeExpression(TypeExpression node) {
+    // TODO(karlklose): come up with a type marker for JS entities or switch to
+    // real constants of type [Type].
+    setValue(node, nonConst());
+  }
 }
 
 /// Represents the abstract value of a primitive value at some point in the