[11] RFR: Fix AArch64, add Shenandoah parts of JDK-8216989

[Andrew Haley]

On 9/4/19 9:31 AM, Aleksey Shipilev wrote:
> We have massive AArch64 failures in sh/jdk11 after recent merge, because we miss the
> Shenandoah-specific parts of JDK-8216989 [1] backport. This fixes it:
>   http://cr.openjdk.java.net/~shade/8216989/webrev.11-sh.01/
> 
> The shape of the affected method is a bit different in sh/jdk11, so I had to adapt it.
> 
> Testing: aarch64 hotspot_gc_shenandoah

FYI: I'm working on the AArch64 8u backport for this same bug.

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