dumpinfo: fix type error in checked mode

pkg/compiler/lib/src/dump_info.dart

Index: pkg/compiler/lib/src/dump_info.dart
diff --git a/pkg/compiler/lib/src/dump_info.dart b/pkg/compiler/lib/src/dump_info.dart
index 5e0d4fe05f83c052f82c3e1f32a4b9aecf00e62f..e89812c9167c08e7ed1e0e430839c53a1173f7af 100644
--- a/pkg/compiler/lib/src/dump_info.dart
+++ b/pkg/compiler/lib/src/dump_info.dart
@@ -459,7 +459,7 @@ class DumpInfoTask extends CompilerTask {
     stopwatch.start();
 
     // Recursively build links to function uses
-    Iterable<FunctionElement> functionElements =
+    Iterable<Element> functionElements =
         infoCollector._elementToInfo.keys.where((k) => k is FunctionElement);
     for (FunctionElement element in functionElements) {
       FunctionInfo info = infoCollector._elementToInfo[element];