RFR: 8294842: Pass actual pending cards to G1Policy::update_young_length_bounds during young gen revise [v2]

[Thomas Schatzl]

> Hi all,
> 
>   can I have reviews for this change that passes the actual amount of pending cards to `G1Policy::update_young_length_bounds` instead of some prediction during young gen revising?
> That improves predictions quite a bit.
> 
> Depends on PR#10647, so please review that one first.
> 
> Testing: gha, local testing, tier1-5 with other changes in this patch series, perf testing with other changes in this patch series

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

  kbarrett review

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/10649/files
  - new: https://git.openjdk.org/jdk/pull/10649/files/6da13c46..01695a9b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10649&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10649&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10649.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10649/head:pull/10649

PR: https://git.openjdk.org/jdk/pull/10649