Update to aarch64-shenandoah-jdk8u292-b05-shenandoah-merge-2021-03-11 (EA)
Update release notes for 8u292-b05-shenandoah-merge-2021-03-11.
Extend s390 patch to fix issue caused by JDK-8252660 backport and lack of JDK-8188813 in 8u.
Revise JDK-8252660 s390 failure to make _soft_max_size a jlong so pointer types are accurate.