RFR(xs): 8073115: assert(_covered_region.contains(p)) needs better error messages

[Sangheon Kim]

Hi All,

Please review this small enhancement for better error messages when assert fails.
This change would be helpful forJDK-8071930  <https://bugs.openjdk.java.net/browse/JDK-8071930>  which is hard to reproduce.

I will need a sponsor for this change.

CR:
https://bugs.openjdk.java.net/browse/JDK-8073115

Webrev:
http://cr.openjdk.java.net/~sangheki/8073115/webrev.00/

Testing:
JPRT

Thanks,
Sangheon

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