RFR: JDK-8267916: Adopt cast notation for CompilerThread conversions [v2]

[Albert Mingkun Yang]

On Wed, 2 Jun 2021 17:19:20 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> as_Worker_thread => WorkerThread::cast could pretty easily be added to this change. There's only one call.

I will do that in another PR to keep this one more focused.

> As Ioi notes, this RFE needs a new synopsis: "Adopt cast notation for CompilerThread conversions" or something like that.

Updated.

Thank you all for the suggestions and reviews.

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PR: https://git.openjdk.java.net/jdk/pull/4240