RFR: 8257450: Start of release updates for JDK 17

Mon Dec 7 16:13:13 UTC 2020

On Sat, 5 Dec 2020 03:17:56 GMT, Mikael Vidstedt <mikael at openjdk.org> wrote:

>> Start of JDK 17 updates.
>
> Marked as reviewed by mikael (Reviewer).

The langtools changes look fine to me. There were additions/changes to jcod files under `test/hotspot/jtreg/runtime/sealedClasses/` made under JDK-8246778, so these may need an update. Sorry about that.

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PR: https://git.openjdk.java.net/jdk/pull/1531