Use simple loop tracking instead of size to determine if

lib/compiler/implementation/elements/elements.dart

Index: lib/compiler/implementation/elements/elements.dart
diff --git a/lib/compiler/implementation/elements/elements.dart b/lib/compiler/implementation/elements/elements.dart
index 7651855f6ffeedc1a4aaa394eed1ce8f2451412f..ed02c05d4590447161fabed5d4b427b2b806e655 100644
--- a/lib/compiler/implementation/elements/elements.dart
+++ b/lib/compiler/implementation/elements/elements.dart
@@ -541,6 +541,7 @@ class FunctionSignature {
 class FunctionElement extends Element {
   FunctionExpression cachedNode;
   Type type;
+  bool calledInLoop = false;

[ngeoffray, 2012/06/12 09:17:40]

This doesn't belong here. An element is something where most things can be final
(Node and Type are not final because they are computed lazily).

You can save such information in the tasks themselves (eg the optimizer task),
with a set of elements or a set of selectors.

[Mads Ager (google), 2012/06/12 11:01:56]

Thanks Nicolas! That makes a lot of sense. I'll collect this information in the
builder instead and use it there. That will actually allow it to hit in
situation where it cannot at this point.

   final Modifiers modifiers;
 
   FunctionSignature functionSignature;