RFR: 8267185: Add string deduplication support to ParallelGC [v2]

[Ivan Walulya]

> Hi all,
> 
> Please review this change to add string deduplication support to ParallelGC.
> 
> Testing: All string deduplication tests, and Tier 1-5.

Ivan Walulya has updated the pull request incrementally with one additional commit since the last revision:

  Kim review

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5085/files
  - new: https://git.openjdk.java.net/jdk/pull/5085/files/b1fe77ae..cd22f565

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5085&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5085&range=00-01

  Stats: 22 lines in 5 files changed: 3 ins; 9 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5085.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5085/head:pull/5085

PR: https://git.openjdk.java.net/jdk/pull/5085