RFR: 8269596: Snapshot soft ref policy before marking/copying

Tue Jun 29 15:07:21 UTC 2021

Set up soft ref policy before marking/copying for Serial, Parallel and G1. With this change, all collectors do soft-ref policy setup in the beginning of a GC cycle.

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Commit messages:
 - soft-setup

Changes: https://git.openjdk.java.net/jdk/pull/4624/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4624&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269596
  Stats: 24 lines in 8 files changed: 2 ins; 16 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4624.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4624/head:pull/4624

PR: https://git.openjdk.java.net/jdk/pull/4624