Use baseline code to compute message locations.

test/message/regress/regress-4266.out

Index: test/message/regress/regress-4266.out
diff --git a/test/message/regress/regress-3995.out b/test/message/regress/regress-4266.out
similarity index 50%
copy from test/message/regress/regress-3995.out
copy to test/message/regress/regress-4266.out
index e4f5b31d1f4b0979ac1b65f6a878a6115611cddd..d31541debe0a9530f0e4045bbdbd269086326e56 100644
--- a/test/message/regress/regress-3995.out
+++ b/test/message/regress/regress-4266.out
@@ -2,9 +2,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-*%(basename)s:6: Error: boom
-  throw new Error("boom");
-  ^
-Error: boom
-    at *%(basename)s:6:9
-    at *%(basename)s:7:3
+*%(basename)s:9: TypeError: [].foo is not a function
+    throw e;
+    ^
+TypeError: [].foo is not a function
+    at *%(basename)s:7:8
+    at *%(basename)s:11:3