Allow method-calls to getters (assuming they contain closures).

frog/leg/ssa/builder.dart

Index: frog/leg/ssa/builder.dart
diff --git a/frog/leg/ssa/builder.dart b/frog/leg/ssa/builder.dart
index 11b6ef20b360fcebf33a6cca4bd45e0f3be57d82..500dfdb4464393c83e56761a33861b2eeacee285 100644
--- a/frog/leg/ssa/builder.dart
+++ b/frog/leg/ssa/builder.dart
@@ -1242,7 +1242,7 @@ class SsaBuilder implements Visitor {
       if (element.kind == ElementKind.GETTER) {
         push(new HInvokeStatic(selector, <HInstruction>[pop()]));
       }
-    } else if (element === null || Elements.isInstanceField(element)) {
+    } else if (Elements.isInstanceSend(send, elements)) {
       HInstruction receiver;
       if (send.receiver == null) {
         receiver = localsHandler.readThis();