[aarch64-port-dev ] RFR: Critical Shenandoah patch for interpreter

[Roman Kennke]

> Please don't. I'd do a simple hg export --git -r <rev> | hg import -
> Takes a few minutes. I did something similar to backport aarch64
> 7 patches to the 2.6 branch yesterday.

BTW, even easier is to pass the URL to the changeset to hg import,
e.g.:

hg import http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/4e239
0beaaca

imports the changeset pointed to by the URL in your current repository.