RFR: 8221360: Eliminate Shared_DirtyCardQ_lock

[Kim Barrett]

Please review this change to the handling of a very rare race condition in
concurrent refinement.  There is a situation where we many be unable to
process a card and need to re-dirty and re-enqueue it for later processing.

The old code handled this using a shared dirty card queue, which various
other places needed to know about as well.  This was the user of the
Shared_DirtyCardQ_lock.  It was the only remaining Mutex whose rank is based
on Mutex::access.

An option for eliminating that lock was to use a lock-free queue.  But
rather than take on that complexity, we instead brute-force the problem.
The new implementation simply allocates and enqueues an entire buffer for
the one card that needs to be reprocessed.  Those operations are already
lock-free.  The extra cost doesn't really matter, since this situation
almost never arises.

This is now done inline in refine_card_concurrently.  It's not worth the
overhead of a class for what is now just a few lines of code needed in
exactly one place.  Places that knew about the shared queue in order to
flush/reset it at certain points no longer have such responsibilities.

This change also renders JDK-8214997 moot, since there aren't any 'access'
locks.
https://bugs.openjdk.java.net/browse/JDK-8214997
Crash holding 'access' lock can deadlock in JVMCI compiler thread

This change also allows the removal of Mutex::access.  That's being left to
a new enhancement, since I think it also allows removing Mutex::tty,
reverting back to using Mutex::event for the tty_lock.  That is, essentially
undo JDK-8214315.
https://bugs.openjdk.java.net/browse/JDK-8272480

Testing:
mach5 tier1-5

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Commit messages:
 - don't use shared dirty card queue

Changes: https://git.openjdk.java.net/jdk/pull/5118/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5118&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8221360
  Stats: 163 lines in 8 files changed: 8 ins; 148 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5118.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5118/head:pull/5118

PR: https://git.openjdk.java.net/jdk/pull/5118