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

[Mandy Chung]

> On Sep 28, 2016, at 9:40 AM, Rachel Protacio <rachel.protacio at oracle.com> wrote:
> 
> Updated webrev: http://cr.openjdk.java.net/~rprotacio/8160064.01/
> 
> Includes simplified test, log_is_enabled checks, and logging on debug level.
> 

Thanks for updating the test which looks good.

log_debug is used in this version.  Does that mean the logging can’t be used in product jvm?  

As Coleen indicates, since there is no impact to the performance and JVM code size, making stackwalk logging a product level flag would be useful for core-libs team.

Mandy