RFR: 8273916: Remove 'special' ranking

[Coleen Phillimore]

On Fri, 17 Sep 2021 11:50:22 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.

Thanks for looking at this, David. I started to map special(-n) to nosafepoint(-n) but since special is nosafepoint - 9 (?) there were interactions with other nosafepoint locks so they needed rankings relative to other locks.

CompiledMethod_lock(nosafepoint-4) -> CodeCache_lock(nosafepoint-3) -> VtableStubs_lock(nosafepoint-2) -> CompiledIC_lock(nosafepoint)

CodeSweeper_lock(nosafepoint-5) -> CompiledMethod_lock(nosafepoint-4)

ThreadsSMRDelete_lock(nosafepoint-2) ->  (can't remember which one was nosafepoint-1 anymore!)

The compiler locks have the deepest nestings.

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