hg: jdk/sandbox: 8209835: Aarch64: elide barriers on all volatile operations

[chris.hegarty at oracle.com]

Changeset: 87bc444ca642
Author:    roland
Date:      2018-11-05 12:53 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/87bc444ca642

8209835: Aarch64: elide barriers on all volatile operations
Reviewed-by: aph, adinn

! src/hotspot/cpu/aarch64/aarch64.ad
+ test/hotspot/jtreg/compiler/c2/aarch64/TestUnsafeVolatileCAE.java
! test/hotspot/jtreg/compiler/c2/aarch64/TestUnsafeVolatileCAS.java
+ test/hotspot/jtreg/compiler/c2/aarch64/TestUnsafeVolatileGAA.java
+ test/hotspot/jtreg/compiler/c2/aarch64/TestUnsafeVolatileGAS.java
+ test/hotspot/jtreg/compiler/c2/aarch64/TestUnsafeVolatileWeakCAS.java
! test/hotspot/jtreg/compiler/c2/aarch64/TestVolatiles.java
! test/hotspot/jtreg/compiler/c2/aarch64/TestVolatilesCMS.java
! test/hotspot/jtreg/compiler/c2/aarch64/TestVolatilesCMSCondMark.java
! test/hotspot/jtreg/compiler/c2/aarch64/TestVolatilesG1.java
! test/hotspot/jtreg/compiler/c2/aarch64/TestVolatilesParallel.java
! test/hotspot/jtreg/compiler/c2/aarch64/TestVolatilesSerial.java