Tweaks to warning level and reporting

test/codegen/expect/methods.txt

Index: test/codegen/expect/methods.txt
diff --git a/test/codegen/expect/methods.txt b/test/codegen/expect/methods.txt
index f7b406fe6da40d7e47fec42297cf56371530212c..40e17d17720fea8e8b5bc959f59db5dd84247f92 100644
--- a/test/codegen/expect/methods.txt
+++ b/test/codegen/expect/methods.txt
@@ -5,6 +5,6 @@ warning: line 14, column 21 of test/codegen/methods.dart: [DownCastImplicit] b (
 warning: line 19, column 12 of test/codegen/methods.dart: [DownCastImplicit] a + b (num) will need runtime check to cast to type int
     return a + b;
            ^^^^^
-warning: line 49, column 3 of test/codegen/methods.dart: [DynamicInvoke] f.bar("Bar's call method!") requires dynamic invoke
+info: line 49, column 3 of test/codegen/methods.dart: [DynamicInvoke] f.bar("Bar's call method!") requires dynamic invoke
   f.bar("Bar's call method!");
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^