hg: panama/dev: Fix build failure on aarch64

[vladimir.x.ivanov at oracle.com]

Changeset: 8527baba9410
Author:    vlivanov
Date:      2020-04-02 20:36 +0300
URL:       https://hg.openjdk.java.net/panama/dev/rev/8527baba9410

Fix build failure on aarch64

! src/hotspot/cpu/aarch64/aarch64.ad