RFR: JDK-8153188: Use log_error(gc, verify) for logging in verification code

[Bengt Rutisson]

Hi everyone,

Could I have a couple of reviews for this change?

http://cr.openjdk.java.net/~brutisso/8153188/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8153188

Some verification code logs using tty. Convert this to use the unified 
logging framework.

Thanks,
Bengt