[aarch64-port-dev ] RFR (XS) 8252366: Shenandoah: revert/cleanup changes in graphKit.cpp

[Andrew Haley]

> This is aarch64-port/jdk8u-shenandoah specific issue:
>    https://bugs.openjdk.java.net/browse/JDK-8252366
>
> The assert seems to fail on ppc64. Also, we might inline g1_write_barrier_pre_helper for clarity.
>
> 8u webrev:
>    https://cr.openjdk.java.net/~shade/8252366/webrev.01/
>
> Testing: x86_64 hotspot_gc_shenandoah

OK, thanks.

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