RFR: 8273916: Remove 'special' ranking

[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.

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Commit messages:
 - 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.

Changes: https://git.openjdk.java.net/jdk/pull/5563/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5563&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273916
  Stats: 129 lines in 26 files changed: 12 ins; 4 del; 113 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