hg: jdk/sandbox: 8233743: AArch64: Make r27 conditionally allocatable

[chris.hegarty at oracle.com]

Changeset: f0634d11b7de
Author:    pli
Date:      2019-12-24 16:51 +0800
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/f0634d11b7de

8233743: AArch64: Make r27 conditionally allocatable
Reviewed-by: aph, dlong

! src/hotspot/cpu/aarch64/aarch64.ad
! src/hotspot/cpu/aarch64/c2_init_aarch64.cpp
! src/hotspot/cpu/aarch64/gc/z/zBarrierSetAssembler_aarch64.cpp
! src/hotspot/cpu/aarch64/sharedRuntime_aarch64.cpp
! src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot.aarch64/src/jdk/vm/ci/hotspot/aarch64/AArch64HotSpotJVMCIBackendFactory.java
! src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot.aarch64/src/jdk/vm/ci/hotspot/aarch64/AArch64HotSpotRegisterConfig.java