RFR: 8357621: G1: Clean up G1BiasedArray [v3]

[Thomas Schatzl]

> Hi all,
> 
>   please review this minor touch-up of the G1BiasedArray classes, removing some unused methods and improving method visibility a bit.
> 
> Testing: gha
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  * fix gtests: move gtest specific code to gtest

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25406/files
  - new: https://git.openjdk.org/jdk/pull/25406/files/fa1c19c8..03da340c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25406&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25406&range=01-02

  Stats: 35 lines in 3 files changed: 16 ins; 17 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25406.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25406/head:pull/25406

PR: https://git.openjdk.org/jdk/pull/25406