git: openjdk/loom: fibers: Some aarch64 work

[duke]

Changeset: 535a3a73
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2021-06-02 11:22:54 +0000
URL:       https://git.openjdk.java.net/loom/commit/535a3a73b4cc10763737a3e3165b3b2cb983b2f6

Some aarch64 work

! src/hotspot/cpu/aarch64/sharedRuntime_aarch64.cpp
! src/hotspot/cpu/aarch64/stubGenerator_aarch64.cpp