RFR: 8191779 : LogCompilation throws java.lang.Error: scope underflow

[Eric Caspole]

Hi everybody,
Apparently due to bit rot in the LogCompilation tool, there can be a 
"scope underflow" error thrown while processing recent logs.

http://cr.openjdk.java.net/~ecaspole/JDK-8191779/webrev/

JBS: https://bugs.openjdk.java.net/browse/JDK-8191779

I currently have a scenario that creates this problem and tested the fix 
there.
Thanks,
Eric