RFR: 8273916: Remove 'special' ranking [v3]

[Coleen Phillimore]

On Tue, 21 Sep 2021 12:07:06 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> This change removes the special ranking and folds it into nosafepoint.  You have to look at commit #3 to see this actual part of the change that doesn't include JDK-8273915.
>> This passes tier1-6 also.
>
> Coleen Phillimore has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:
> 
>  - Remove blank line.
>  - Merge branch 'master' into remove-special
>  - Add comment about ThreadSMRDelete_lock
>  - Remove "special" rank.
>  - Partition safepoint checking and nonchecking lock ranks.  The nonchecking locks are always lower ranked than the safepoint checking locks because they cannot block.
>  - Partition safepoint checking and nonchecking lock ranks.  The nonchecking locks are always lower ranked than the safepoint checking locks because they cannot block.

Thanks Patricio for the code review!

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PR: https://git.openjdk.java.net/jdk/pull/5563