RFR: 8355756: G1HeapSizingPolicy::full_collection_resize_amount should consider allocation size [v4]

[Ivan Walulya]

> Hi,
> 
> Please review this change to account for pending allocations when deciding how much to shrink the heap after a full gc. Otherwise, we shrink the heap only to trigger an expansion to satisfy the allocation request that triggered the full gc.
> 
> Testing: Tier 1-3

Ivan Walulya has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:

 - Merge remote-tracking branch 'upstream/master' into full_collection_resize_amount
 - use align_up_to_region_byte_size
 - Merge remote-tracking branch 'upstream/master' into full_collection_resize_amount
 - Thomas Review
 - nit
 - refactor full collection

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Changes: https://git.openjdk.org/jdk/pull/24944/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24944&range=03
  Stats: 42 lines in 8 files changed: 19 ins; 0 del; 23 mod
  Patch: https://git.openjdk.org/jdk/pull/24944.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24944/head:pull/24944

PR: https://git.openjdk.org/jdk/pull/24944