[8u] RFR: 8149548: slowdebug build crashes if -XX:+TraceBytecodes flag is used

[Sergey Nazarkin]

Hi!

Please review fix for JDK8 interpreter.  The changeset covers several SIGILL and NPE generated by signal handler

To reproduce call “java -XX:+TraceBytecodes -version”

http://cr.openjdk.java.net/~snazarki/8149548/

Sergey Nazarkin