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

[Coleen Phillimore]

> 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.

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Changes: https://git.openjdk.java.net/jdk/pull/5563/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5563&range=02
  Stats: 44 lines in 5 files changed: 0 ins; 5 del; 39 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5563.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5563/head:pull/5563

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