RFR(S): 8160064: StackWalker implementation added logging option without using UL

[Rachel Protacio]

Updated webrev: http://cr.openjdk.java.net/~rprotacio/8160064.01/

Includes simplified test, log_is_enabled checks, and logging on debug level.

Thanks,
Rachel

On 9/27/2016 3:47 PM, Rachel Protacio wrote:
> Hi,
>
> Please review this small fix correcting the StackWalker print output 
> mechanism by moving it to Unified Logging. Includes a new jtreg test, 
> and passes JPRT.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8160064
> Open webrev: http://cr.openjdk.java.net/~rprotacio/8160064/
>
> Thank you!
> Rachel