Update to aarch64-shenandoah-jdk8u252-b01.
Switch to EA mode.
Adjust JDK-8199936/PR3533 patch following JDK-8227397 configure change
Make use of --with-extra-asflags introduced in jdk8u252-b01.
Drop obsolete local patch, JDK-8219772, now that ASFLAGS are properly handled.