git: openjdk/jdk15u-dev: 8259271: gc/parallel/TestDynShrinkHeap.java still fails "assert(covered_region.contains(new_memregion)) failed: new region is not in covered_region"

[Yuri Nesterenko]

Changeset: 7ac92474
Author:    Olga Mikhaltsova <omikhaltcova at openjdk.org>
Committer: Yuri Nesterenko <yan at openjdk.org>
Date:      2021-09-17 13:56:11 +0000
URL:       https://git.openjdk.java.net/jdk15u-dev/commit/7ac92474d592ace2ce4084427edc7c5565cc18a3

8259271: gc/parallel/TestDynShrinkHeap.java still fails "assert(covered_region.contains(new_memregion)) failed: new region is not in covered_region"

Use load_acquire to order reads of top and end.

Backport-of: 685c03dc4899e4f43e830d516b751969ed20ec21

! src/hotspot/share/gc/parallel/mutableSpace.cpp