hg: jdk/sandbox: 8239825: G1: Simplify threshold test for mutator refinement

[chris.hegarty at oracle.com]

Changeset: 10f11578b1f4
Author:    kbarrett
Date:      2020-03-13 15:36 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/10f11578b1f4

8239825: G1: Simplify threshold test for mutator refinement
Summary: Compute refinement threshold when values change, not on each use.
Reviewed-by: tschatzl, sangheki

! src/hotspot/share/gc/g1/g1ConcurrentRefine.cpp
! src/hotspot/share/gc/g1/g1DirtyCardQueue.cpp
! src/hotspot/share/gc/g1/g1DirtyCardQueue.hpp