RFR: 8268368: Adopt cast notation for JavaThread conversions [v3]

[Guoxiong Li]

On Tue, 22 Jun 2021 12:56:27 GMT, David Holmes <dholmes at openjdk.org> wrote:

> I can sponsor, but as per hotspot integration guidelines we should wait at least 24 hours to give people in different timezones a chance to comment.

Got it. Thanks a lot!

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PR: https://git.openjdk.java.net/jdk/pull/4546