[aarch64-port-dev ] [8u] RFR (M) 8228400: Remove built-in AArch64 simulator

[Aleksey Shipilev]

This is the backport of cleanup/removal in 8u-aarch64:
  https://bugs.openjdk.java.net/browse/JDK-8228400
  https://hg.openjdk.java.net/jdk/jdk/rev/01bca26734bb

8u-aarch64 webrev:
  https://cr.openjdk.java.net/~shade/8228400/webrev.8u.01/

Testing: aarch64 build, hotspot_gc_shenandoah (for the lack of tier1)

-- 
Thanks,
-Aleksey