RFR: 8329096: G1: Change the type of G1BlockOffsetTable::_offset_base to uint8_t* [v2]

[Guoxiong Li]

> Hi all,
> 
> This patch changes the type of `G1BlockOffsetTable::_offset_base` to `uint8_t*`, just like `SerialBlockOffsetSharedArray::_offset_base` and `ObjectStartArray::_offset_base`. The tests `make test-tier1_gc` passed locally.
> 
> Thanks for taking the time to review.
> 
> Best Regards,
> -- Guoxiong

Guoxiong Li has updated the pull request incrementally with one additional commit since the last revision:

  Use UINT8_MAX. Remove unnecessary white space.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18502/files
  - new: https://git.openjdk.org/jdk/pull/18502/files/ccae364a..ad60e640

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18502&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18502&range=00-01

  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/18502.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18502/head:pull/18502

PR: https://git.openjdk.org/jdk/pull/18502