RFR: 8318647: Serial: Refactor BlockOffsetTable [v4]

[Albert Mingkun Yang]

> The diff is too large; maybe it's better to read the new impl directly, which I believe is much easier to follow.
> 
> There is some duplication with G1's implementation, which should probably be dealt with in its own PR.

Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains seven additional commits since the last revision:

 - uint8
 - s1-rename
 - s1-rename
 - Merge branch 'master' into s1-bot
 - review
 - review
 - s1-bot

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16304/files
  - new: https://git.openjdk.org/jdk/pull/16304/files/a4f6ea8f..eabe68de

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16304&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16304&range=02-03

  Stats: 17445 lines in 1039 files changed: 9157 ins; 3690 del; 4598 mod
  Patch: https://git.openjdk.org/jdk/pull/16304.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16304/head:pull/16304

PR: https://git.openjdk.org/jdk/pull/16304