RFR: Merge openjdk/jdk:master

[Aleksey Shipilev]

On Wed, 8 Sep 2021 21:31:40 GMT, William Kemper <wkemper at openjdk.org> wrote:

> This is a great big merge from upstream openjdk. No conflicts outside of `gc/shenandoah`. Most of the conflicts were around the closures that had a class template parameter for string duplication changes (we've added a template parameter for generation to most of the same).

All right. YOLO! Please integrate.

jcheck complains about the whitespace, need to fix that before integration.

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Marked as reviewed by shade (Committer).

PR: https://git.openjdk.java.net/shenandoah/pull/65