git: openjdk/mobile: 8243478: Shenandoah: avoid implicit worker_id = 0

[duke]

Changeset: 8db99485
Author:    Zhengyu Gu <zgu at openjdk.org>
Date:      2020-04-23 10:14:42 +0000
URL:       https://git.openjdk.java.net/mobile/commit/8db99485

8243478: Shenandoah: avoid implicit worker_id = 0

Reviewed-by: shade

! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.hpp