6637203: Classunloading messages go to stdout rather than Xloggc file, causing hangs when stdout is closed

Decoupled TraceClassUnloading from verbose:gc, JVMTI_VERBOSE_GC and PrintGC[Details], making it settable in a manner identical to TraceClassLoading. Reverted an inadvertent change of TraceClassUnloading output in a previous changeset from gclog back to tty.

Reviewed-by: coleenp, dholmes, jmasa, poonam
3 files changed