Add shared tests demonstrating bugs #25624, #25625, and #25626.

tests/language/accessor_conflict_getter.dart

Index: tests/language/accessor_conflict_getter.dart
diff --git a/pkg/analyzer_cli/test/data/package_with_embedder_yaml/lib/grizzly.dart b/tests/language/accessor_conflict_getter.dart
similarity index 86%
copy from pkg/analyzer_cli/test/data/package_with_embedder_yaml/lib/grizzly.dart
copy to tests/language/accessor_conflict_getter.dart
index d575643598c26036bc0e72a3592eeccc5d6eaf44..5b8d72fad773b7cf48fd0e0f9b40c3cd8669628d 100644
--- a/pkg/analyzer_cli/test/data/package_with_embedder_yaml/lib/grizzly.dart
+++ b/tests/language/accessor_conflict_getter.dart
@@ -2,6 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library grizzly;
+var getValue;
 
-class Bear {}
+get x => getValue;