Check for proper types from error handling code

test/mjsunit/regress/regress-596718.js

Index: test/mjsunit/regress/regress-596718.js
diff --git a/test/message/regress/regress-4829-1.js b/test/mjsunit/regress/regress-596718.js
similarity index 54%
copy from test/message/regress/regress-4829-1.js
copy to test/mjsunit/regress/regress-596718.js
index 1ad5feda8cb96cd24e4c47f7407c9699d150c327..b81ae2704ac208c83b3073b87185e40a27fbbcda 100644
--- a/test/message/regress/regress-4829-1.js
+++ b/test/mjsunit/regress/regress-596718.js
@@ -2,6 +2,5 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-function tag() {}
-
-tag(tag`\xyy`);
+Error.prepareStackTrace = function(e, frames) { return frames; }
+assertThrows(() => new Error().stack[0].getMethodName.call({}), TypeError);