Introduces the new syntax for deferred loading

sdk/lib/_internal/compiler/implementation/resolution/members.dart

Index: sdk/lib/_internal/compiler/implementation/resolution/members.dart
diff --git a/sdk/lib/_internal/compiler/implementation/resolution/members.dart b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
index 66c29e25b86a6f5bc40e605e9090ef5a623c27c1..ddb5a075f63cfceefd8989bd1818e898dbbaedde 100644
--- a/sdk/lib/_internal/compiler/implementation/resolution/members.dart
+++ b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
@@ -464,14 +464,18 @@ class ResolverTask extends CompilerTask {
         return elements;
       }
       if (element.isSynthesized) {
-        Element target = element.targetConstructor;
-        // Ensure the signature of the synthesized element is
-        // resolved. This is the only place where the resolver is
-        // seeing this element.
-        element.computeSignature(compiler);
-        if (!target.isErroneous()) {
-          compiler.enqueuer.resolution.registerStaticUse(
-              element.targetConstructor);
+        if (isConstructor) {
+          Element target = element.targetConstructor;
+          // Ensure the signature of the synthesized element is
+          // resolved. This is the only place where the resolver is
+          // seeing this element.
+          element.computeSignature(compiler);
+          if (!target.isErroneous()) {
+            compiler.enqueuer.resolution.registerStaticUse(
+                element.targetConstructor);
+          }
+        } else {
+          assert(element.isDeferredLoaderGetter());
         }
         return _ensureTreeElements(element);
       }