RFR: JDK-8304820: Statically allocate ObjectSynchronizer mutexes [v2]

[Justin King]

> Similar to https://git.openjdk.org/jdk/pull/13143, statically allocate mutexes which live for the lifetime of the process.

Justin King has updated the pull request incrementally with one additional commit since the last revision:

  Update existing spacing since line is being touched anyway
  
  Signed-off-by: Justin King <jcking at google.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13160/files
  - new: https://git.openjdk.org/jdk/pull/13160/files/0ff0ebd0..d6afef79

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13160&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13160&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13160.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13160/head:pull/13160

PR: https://git.openjdk.org/jdk/pull/13160