RFR: 8257145: Performance regression with -XX:-ResizePLAB after JDK-8079555 [v3]

[Dongbo He]

> Hi,
> 
> this is the continuation of the review of the implementation for:
> 
> https://bugs.openjdk.java.net/browse/JDK-8257145

Dongbo He has updated the pull request incrementally with one additional commit since the last revision:

  Refactor the code

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1474/files
  - new: https://git.openjdk.java.net/jdk/pull/1474/files/04102cbc..dd3f9b7c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1474&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1474&range=01-02

  Stats: 8 lines in 4 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1474.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1474/head:pull/1474

PR: https://git.openjdk.java.net/jdk/pull/1474