RFR(S): 8141356: Explicitly stop CMS threads during VM termination.

[Jungwoo Ha]

BUG: https://bugs.openjdk.java.net/browse/JDK-8141356
Webrev: http://cr.openjdk.java.net/~jwha/8141356/webrev.00/

Inside before_exit(), it says

  // Stop concurrent GC threads
  Universe::heap()->stop();

but GenCollectedHeap never implemented stop() method, and thus calling
empty SharedHeap::stop() method.
This causes CMS threads to run during the VM termination and ends up
crashing.
ConcurrentMarkSweepThread::stop() is currently a dead code and never gets
called.
The patch just implemented GenCollectedHeap::stop() to call
ConcurrentMarkSweepThread::stop().

Can someone sponsor this patch?

-- 
Jungwoo Ha | Google | jwha at google.com
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