RFR: Merge jdk:master

[Kevin Rushforth]

On Wed, 9 Sep 2020 17:21:39 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> This is a merge-style PR for the initial changes needed to merge jdk/master into lanai/master so we can change the
> auto-sync to use jdk/master instead of the retired client/master.
> There were several merge conflicts that arose from this due to the fact that the client and jdk git repos had diverged.
> This was caused by a change in the OpenJDK Census data that in turn caused a different git commit hash when converting
> an identical HG commit in the client repo and the jdk repo at two different times. As a result, there are a total of
> 474 commits in the jdk repo that duplicate (but with a different commit hash) commits in the client repo.

@prrace any concerns before I integrate this?

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PR: https://git.openjdk.java.net/lanai/pull/93