Fix invalid location in inline super constructor.

tests/compiler/dart2js_extra/source_mapping_crash_source.dart

Index: tests/compiler/dart2js_extra/source_mapping_crash_source.dart
diff --git a/tests/compiler/dart2js_extra/inline_position_crash_source.dart b/tests/compiler/dart2js_extra/source_mapping_crash_source.dart
similarity index 97%
copy from tests/compiler/dart2js_extra/inline_position_crash_source.dart
copy to tests/compiler/dart2js_extra/source_mapping_crash_source.dart
index 64d03cee0b7df5101544659324d892ad9ba68427..825360f25dbbe87a3bd056cf271dfcd1f78bb7d5 100644
--- a/tests/compiler/dart2js_extra/inline_position_crash_source.dart
+++ b/tests/compiler/dart2js_extra/source_mapping_crash_source.dart
@@ -4,7 +4,7 @@
 
 /*******************************************************************************
  * Long comment to make positions in this file exceed those in
- * 'inline_position_crash_source.dart'.
+ * 'source_mapping_crash_test.dart'.
  *******************************************************************************
  *******************************************************************************
  *******************************************************************************
@@ -49,6 +49,6 @@
  *******************************************************************************
  */
 class Super {
-  final fisk;
-  Super() : fisk = (() => null);
+  final sb = new StringBuffer();
+  Super(var y);
 }