RFR: 8289800: G1: G1CollectionSet::finalize_young_part clears survivor list too early

[Ivan Walulya]

Hi all,

Please review this small change to clear survivor regions list only after predictions for survivor_regions_evac_time are done.

Test: tier1

//Ivan

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Commit messages:
 - 8289800: G1: G1CollectionSet::finalize_young_part clears survivor list too early

Changes: https://git.openjdk.org/jdk/pull/9401/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9401&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289800
  Stats: 6 lines in 1 file changed: 3 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9401.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9401/head:pull/9401

PR: https://git.openjdk.org/jdk/pull/9401