Fix type conversion of malformed type

pkg/compiler/lib/src/ssa/nodes.dart

Index: pkg/compiler/lib/src/ssa/nodes.dart
diff --git a/pkg/compiler/lib/src/ssa/nodes.dart b/pkg/compiler/lib/src/ssa/nodes.dart
index c40c1584cd4fc3f9148762e87b714d6491938708..f2d1af7022316fca4b1200b6a19a841ebf8575d6 100644
--- a/pkg/compiler/lib/src/ssa/nodes.dart
+++ b/pkg/compiler/lib/src/ssa/nodes.dart
@@ -1374,9 +1374,8 @@ abstract class HInstruction implements Spannable {
     assert(type.treatAsRaw || type.isFunctionType);
     if (type.isDynamic) return this;
     if (type.isObject) return this;
-    // The type element is either a class or the void element.
     JavaScriptBackend backend = compiler.backend;
-    if (type.isVoid || type.isFunctionType) {
+    if (type.isVoid || type.isFunctionType || type.isMalformed) {
       return new HTypeConversion(type, kind, backend.dynamicType, this);
     }
     assert(type.isInterfaceType);