RFR: 8013917 Kitchensink crashed with SIGSEGV in BaselineReporter::diff_callsites

[Zhengyu Gu]

A simple bug fix on NMT reporting code. When memory allocated from a 
callsite has been freed, the callsite should use baselined record to 
report callsite and the memory should now be 0.

External: Not available
JBS: https://jbs.oracle.com/bugs/browse/JDK-8013917
Webrev: http://cr.openjdk.java.net/~zgu/8013917/webrev.00/ 
<http://cr.openjdk.java.net/%7Ezgu/8013917/webrev.00/>

Tests:
   - JPRT
   - Kitchensink on reported platform Solaris-x64
   - New jtreg testcase:  failed without patch, passed with the patch.

Thanks,

-Zhengyu