review request (S) - small add-on to 6888954 assert arg formatting

[John Coomes]

I (John.Coomes at oracle.com) wrote:
> This patch adds some code and a test script to exercise the error
> handler.  It was useful when testing the changes for
> 
> 	6888954 argument formatting for assert() and friends
> 
> http://cr.openjdk.java.net/~jcoomes/6888954-error-test/

After running the test on different platforms (with and without
jtreg), I made some minor changes, mostly to the test script.  The
above URL has details on the changes and a link to the original
webrev.

-John