RFR: CRITICAL: 8270533: AArch64: size_fits_all_mem_uses should return false if its output is a CAS

[Andrew Haley]

https://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/rev/54326de2a1d7 was back-ported
to 8u, but it contains a bug, and this bug causes hard crashes in production.

http://cr.openjdk.java.net/~aph/8270533/
https://bugs.openjdk.java.net/browse/JDK-8270533

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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