git: openjdk/jdk17u: master: 8273378: Shenandoah: Remove the remaining uses of os::is_MP

[Aleksey Shipilev]

Changeset: c136c188
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2021-10-01 06:25:41 +0000
URL:       https://git.openjdk.java.net/jdk17u/commit/c136c188b519aa315985c9dd0bbe9fedbf182175

8273378: Shenandoah: Remove the remaining uses of os::is_MP

Backport-of: fc546d6de9a3ed33cf4b04e24e62714332b069cb

! src/hotspot/cpu/x86/gc/shenandoah/shenandoahBarrierSetAssembler_x86.cpp