RFR: 8268164: Adopt cast notation for WorkerThread conversions

[Stefan Karlsson]

On Thu, 3 Jun 2021 11:21:11 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Followup of JDK-8267916 (#4240), the same refactoring for `WorkerThread`.

I now see that they actually have this for the CompilerThread:
https://github.com/openjdk/jdk/pull/4240/files#diff-2dcac7a3550ebd199e8cffdeaabdba67643e794c6a6f9b0042a8cfe7dbaa9066

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PR: https://git.openjdk.java.net/jdk/pull/4334