git: openjdk/loom: fibers: More aarch64 work

[duke]

Changeset: f20d87b6
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2021-06-04 09:09:48 +0000
URL:       https://git.openjdk.java.net/loom/commit/f20d87b6a8b1dfbffaf5eb120500b8e86ce7513a

More aarch64 work

! src/hotspot/cpu/aarch64/stubGenerator_aarch64.cpp
! src/hotspot/cpu/x86/stubGenerator_x86_64.cpp