RFR (XXS): 8208297: Allow printing of taskqueue stats if compiled in in product builds

[Thomas Schatzl]

Hi all,

  please review this trivial patch that changes some
log_develop_is_enabled(Trace, ...) to log_is_enabled(Trace, ...) to
allow printing of task queue stats if they are collected (by setting
TASKQUEUE_STATS) in product builds with Parallel/CMS without any
additional changes too.

CR:
https://bugs.openjdk.java.net/browse/JDK-8208297
Webrev:
http://cr.openjdk.java.net/~tschatzl/8208297/webrev/
Testing:
local compilation/use

Thanks,
  Thomas