Implement redirecting factories in mirrors.

sdk/lib/_internal/compiler/implementation/ssa/builder.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/builder.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/ssa/builder.dart	(revision 27512)
+++ sdk/lib/_internal/compiler/implementation/ssa/builder.dart	(working copy)
@@ -4183,8 +4183,34 @@
     }
     HInstruction value;
     if (node.isRedirectingFactoryBody) {
-      // TODO(ahe): This is only for reflection, and it is not correct yet.
-      value = graph.addConstantNull(compiler);
+      FunctionElement element = elements[node.expression];
+      FunctionElement function = currentElement;
+      List<HInstruction> inputs = <HInstruction>[];
+      FunctionSignature calleeSignature = element.functionSignature;
+      FunctionSignature callerSignature = function.functionSignature;
+      callerSignature.forEachRequiredParameter((Element element) {
+        inputs.add(localsHandler.readLocal(element));
+      });
+      List<Element> calleeOptionals =
+          calleeSignature.orderedOptionalParameters;
+      List<Element> callerOptionals =
+          callerSignature.orderedOptionalParameters;
+      int i = 0;
+      for (; i < callerOptionals.length; i++) {
+        inputs.add(localsHandler.readLocal(callerOptionals[i]));
+      }
+      for (; i < calleeOptionals.length; i++) {
+        inputs.add(handleConstantForOptionalParameter(calleeOptionals[i]));
+      }
+
+      if (backend.classNeedsRti(element.getEnclosingClass())) {
+        ClassElement cls = function.getEnclosingClass();
+        cls.typeVariables.forEach((TypeVariableType typeVariable) {
+          inputs.add(localsHandler.readLocal(typeVariable.element));
+        });
+      }
+      pushInvokeStatic(node, element, inputs);
+      value = pop();
     } else if (node.expression == null) {
       value = graph.addConstantNull(compiler);
     } else {