RFR (XS) 8221735: Shenandoah fails ctw/modules/jdk_management_agent.java with Traversal

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8221735

Fix:

diff -r e0603b4537c3 src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp
--- a/src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp  Mon Apr 01 10:04:22 2019 +0200
+++ b/src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp  Mon Apr 01 11:49:36 2019 +0200
@@ -3398,10 +3398,11 @@
 }

 int ShenandoahEnqueueBarrierNode::needed(Node* n) {
   if (n == NULL ||
       n->is_Allocate() ||
+      n->Opcode() == Op_ShenandoahEnqueueBarrier ||
       n->bottom_type() == TypePtr::NULL_PTR ||
       (n->bottom_type()->make_oopptr() != NULL && n->bottom_type()->make_oopptr()->const_oop() !=
NULL)) {
     return NotNeeded;
   }
   if (n->is_Phi() ||


Testing: hotspot_gc_shenandoah, ctw tests for both jdk/jdk and sh/jdk

-- 
Thanks,
-Aleksey