8252853: AArch64: gc/shenandoah/TestVerifyJCStress.java fails intermittently with C1

Reviewed-by: zgu, rkennke
Backport-of: 4fb1980

Author: shipilev

src/hotspot/cpu/aarch64/gc/shenandoah/shenandoahBarrierSetAssembler_aarch64.cpp

@@ -263,16 +263,9 @@ void ShenandoahBarrierSetAssembler::load_reference_barrier_not_null(MacroAssembl
 
 void ShenandoahBarrierSetAssembler::iu_barrier(MacroAssembler* masm, Register dst, Register tmp) {
   if (ShenandoahIUBarrier) {
-    // Save possibly live regs.
-    RegSet live_regs = RegSet::range(r0, r4) - dst;
-    __ push(live_regs, sp);
-    __ strd(v0, __ pre(sp, 2 * -wordSize));
-
+    __ push_call_clobbered_registers();
     satb_write_barrier_pre(masm, noreg, dst, rthread, tmp, true, false);
-
-    // Restore possibly live regs.
-    __ ldrd(v0, __ post(sp, 2 * wordSize));
-    __ pop(live_regs, sp);
+    __ pop_call_clobbered_registers();
   }
 }
 

test/hotspot/jtreg/gc/shenandoah/TestVerifyJCStress.java

@@ -1,5 +1,6 @@
 /*
- * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
+ * Copyright (c) 2017, 2020, Red Hat, Inc. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
@@ -71,6 +72,11 @@
  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
  *      -XX:+ShenandoahVerify -XX:+IgnoreUnrecognizedVMOptions -XX:+ShenandoahVerifyOptoBarriers
  *      TestVerifyJCStress
+ *
+ * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions
+ *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
+ *      -XX:+ShenandoahVerify -XX:+IgnoreUnrecognizedVMOptions -XX:TieredStopAtLevel=1
+ *      TestVerifyJCStress
  */
 
 import java.util.*;