RFR: 8259067: bootclasspath append takes out object lock [v2]

[Coleen Phillimore]

> See CR for details.
> I made the classpath append list lock-free.  Calling experts in Atomic operations...
> Tested with tier1-6.
> Thanks,
> Coleen

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Simplify with a Mutex.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1935/files
  - new: https://git.openjdk.java.net/jdk/pull/1935/files/f132d7bd..fb8e87d7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1935&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1935&range=00-01

  Stats: 29 lines in 5 files changed: 6 ins; 12 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1935.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1935/head:pull/1935

PR: https://git.openjdk.java.net/jdk/pull/1935