RFR: 8273917: Remove 'leaf' ranking for Mutex

[Coleen Phillimore]

This change removes 'leaf' ranking.  The previous change for JDK-8273915 divided the 'leaf' ranked locks that didn't safepoint check into the rank 'nosafepoint', so all the 'leaf' ranking locks left were safepoint_check_always.

The rank 'nonleaf' (to be renamed 'safepoint' in the next change) is the *top* mutex rank.

The transformation in this change is as follows:
   nonleaf+n   => nonleaf   - Generally these 'nonleaf' mutex were top level locks)
   leaf => nonleaf                - Many of these locks were top level locks
   leaf => nonleaf-2             - Assuming that they were 'leaf' and 2 levels less than some existing nonleaf lock
   leaf-n => nonleaf-n

The new mutex rankings reflect their rankings based on my logging, except for a couple shenandoah locks which I didn't observe, so I made them nonleaf-2.

This change also introduces a relative mutex ranking macro, so that a Mutex/Monitor can be defined in terms of a mutex that it holds while trying to acquire it.  So these relative mutex are moved to the end of the init function in mutexLocker.cpp.

This has been tested with tier1-8, and retesting tier1-3 locally in progress.

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Commit messages:
 - Fix lock name.
 - 8273917: Remove 'leaf' ranking for Mutex

Changes: https://git.openjdk.java.net/jdk/pull/5801/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5801&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273917
  Stats: 139 lines in 11 files changed: 54 ins; 23 del; 62 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5801.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5801/head:pull/5801

PR: https://git.openjdk.java.net/jdk/pull/5801