RFR: 8012263: ciReplay: gracefully exit & report meaningful error when replay data parsing fails

[Yumin Qi]

HI, please review the XS change for

8012263: ciReplay: gracefully exit & report meaningful error when replay 
data parsing fails
Summary: find_method could return NULL so need explicitly check if there 
is error after parse_method, exit on error to avoid crash.

http://cr.openjdk.java.net/~minqi/8012263/ 
<http://cr.openjdk.java.net/%7Eminqi/8012263/>
Tests: JPRT

Thanks
Yumin
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