RFR: 8256306: ObjectMonitor::_contentions field should not be 'jint' [v2]

[Coleen Phillimore]

On Tue, 22 Jun 2021 21:07:04 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> I changed the _contentions and _waiters fields from jint to int and ran tests tier1-3.  Tested tier1 with linux, mac, windows platforms. Also changed the _previous_owner_tid to unintptr_t from jlong, since that's what the cast did.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix INT32_MIN and cache padding.

Thank you David, Dan and Thomas.  There are a few other jlongs hanging around in that file, but that's for another day.

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PR: https://git.openjdk.java.net/jdk/pull/3980