RFR: 8268443: ParallelGC Full GC should use parallel WeakProcessor

[Stefan Johansson]

On Wed, 9 Jun 2021 20:46:15 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of making weak oops processing in Full GC cycles parallel for Parallel collector.
> 
> Tested: running benchmarks with `gc+phases=debug` and confirm the `Weak Processing` time in Full GCs becomes shorter.

Looks good!

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Marked as reviewed by sjohanss (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4444