RFR: JDK-8267916: Make as_CompilerThread consistent with other as_*_thread methods [v2]

[David Holmes]

On Wed, 2 Jun 2021 21:49:28 GMT, David Holmes <dholmes at openjdk.org> wrote:

> The change to CompilerThread::cast doesn't seem necessary to address any circular header dependencies - what am I missing?

Doh! I was missing the fact the cast method goes in compilerThread.hpp not thread.hpp.

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