RFR: 8264742: member variable _monitor of MonitorLocker is redundant

[Xin Liu]

On Tue, 6 Apr 2021 12:18:41 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This is ok. I was worried about the cast defeating type safety but as long as as_monitor is in MonitorLocker, that's fine.

hi, Coleen,
 
Thank you for reviewing this patch! 
FWIW,  the type of _mutex is Monitor* in MonitorLocker object. `static_cast<Monitor*>` just makes use that. Arbitrary casting is error-prone, but this is not the case.

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PR: https://git.openjdk.java.net/jdk/pull/3350