git: openjdk/jdk17: 8225667: Clarify the behavior of System::gc w.r.t. reference processing

[Mandy Chung]

Changeset: 3a690240
Author:    Mandy Chung <mchung at openjdk.org>
Date:      2021-07-06 14:59:42 +0000
URL:       https://git.openjdk.java.net/jdk17/commit/3a690240336bda8582a15ca52f4dcb78be323dcd

8225667: Clarify the behavior of System::gc w.r.t. reference processing

Reviewed-by: rriggs, kbarrett, tschatzl

! src/java.base/share/classes/java/lang/Runtime.java
! src/java.base/share/classes/java/lang/System.java