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

Thu Jul 1 12:46:24 UTC 2021

On Tue, 29 Jun 2021 14:58:10 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> 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.

Merged `enable_discovery` and `setup_policy` into one call, and made `setup_policy` private.

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