RFR: 8017478 Kitchensink crashed with SIGSEGV in BaselineReporter::diff_callsites

[Zhengyu Gu]

This is a fix for null pointers that are not carefully dealt with. Added assertions to prevent it from happening again.


External bug: Not available.
JBS: https://jbs.oracle.com/bugs/browse/JDK-8017478 
Webrev: http://cr.openjdk.java.net/~zgu/8017478/webrev.00/


Thanks,

-Zhengyu