RFR: 8329767: G1: Move G1BlockOffsetTable::set_for_starts_humongous to HeapRegion

[Guoxiong Li]

Hi all,

This patch moves the method `G1BlockOffsetTable::set_for_starts_humongous` into `HeapRegion::set_starts_humongous` and marks `G1BlockOffsetTable::update_for_block(HeapWord* blk_start, size_t size)` as public (because it delegates to another public method which has the same name).

Thanks for taking the time to review.

Best Regards,
-- Guoxiong

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Commit messages:
 - JDK-8329767

Changes: https://git.openjdk.org/jdk/pull/18701/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18701&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329767
  Stats: 18 lines in 3 files changed: 5 ins; 11 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18701.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18701/head:pull/18701

PR: https://git.openjdk.org/jdk/pull/18701