RFR: 8260574: Remove parallel constructs in GenCollectedHeap::process_roots

Thu Jan 28 09:59:41 UTC 2021

On Thu, 28 Jan 2021 09:10:52 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> This PR is broken into two commits for easier reviewing, one for removing the usage of `SubTasksDone` in `GenCollectedHeap`, and the other for removing `StrongRootsScope` in the call chain of `GenCollectedHeap::process_roots`.
> 
> Tested: hotspot_gc

Lgtm.

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Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2280