RFR: 8252476: as_Worker_thread() doesn't check what it intends [v3]

[Ioi Lam]

On Wed, 26 May 2021 20:31:20 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Convert `as_Worker_thread` to non-virtual, like other `as_*_thread` methods.
>
> Albert Mingkun Yang has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - inline
>  - tmp

Marked as reviewed by iklam (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/4167