Change IR encoding of redirecting factory invocations.

pkg/compiler/lib/src/kernel/kernel_visitor.dart

Index: pkg/compiler/lib/src/kernel/kernel_visitor.dart
diff --git a/pkg/compiler/lib/src/kernel/kernel_visitor.dart b/pkg/compiler/lib/src/kernel/kernel_visitor.dart
index e6ed1e475a1b2cc5d6d200fa58713f8de56e429d..39a1a8d82024747a9ee131a5496efe576781eb37 100644
--- a/pkg/compiler/lib/src/kernel/kernel_visitor.dart
+++ b/pkg/compiler/lib/src/kernel/kernel_visitor.dart
@@ -1158,13 +1158,8 @@ class KernelVisitor extends Object
 
   ir.Expression buildConstructorInvoke(NewExpression node, {bool isConst}) {
     ConstructorElement constructor = elements[node.send];
-    ConstructorTarget target;
-    if (isConst) {
-      target =
-          kernel.computeEffectiveTarget(constructor, elements.getType(node));
-    } else {
-      target = new ConstructorTarget(constructor, elements.getType(node));
-    }
+    ConstructorTarget target =
+        kernel.computeEffectiveTarget(constructor, elements.getType(node));
     NodeList arguments = node.send.argumentsNode;
     if (kernel.isSyntheticError(target.element)) {
       return new ir.MethodInvocation(new ir.InvalidExpression(),