From 1c38036fd886c4dc3230a4fe7050fcb47bb17f2f Mon Sep 17 00:00:00 2001
From: Roland Westrelin <roland@openjdk.org>
Date: Wed, 25 Mar 2015 14:25:53 +0100
Subject: [PATCH] 8075922: assert(t == t_no_spec) fails in phaseX.cpp

Subgraph becomes dead RegionNode::Ideal() but is not destroyed

Reviewed-by: kvn, vlivanov
---
 hotspot/src/share/vm/opto/cfgnode.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/hotspot/src/share/vm/opto/cfgnode.cpp b/hotspot/src/share/vm/opto/cfgnode.cpp
index f609cf4e8a9..fcb3fcd2c20 100644
--- a/hotspot/src/share/vm/opto/cfgnode.cpp
+++ b/hotspot/src/share/vm/opto/cfgnode.cpp
@@ -525,13 +525,16 @@ Node *RegionNode::Ideal(PhaseGVN *phase, bool can_reshape) {
       // Cut the backedge input and remove phis since no data paths left.
       // We don't cut outputs to other nodes here since we need to put them
       // on the worklist.
+      PhaseIterGVN *igvn = phase->is_IterGVN();
+      if (in(1)->outcnt() == 1) {
+        igvn->_worklist.push(in(1));
+      }
       del_req(1);
       cnt = 0;
       assert( req() == 1, "no more inputs expected" );
       uint max = outcnt();
       bool progress = true;
       Node *top = phase->C->top();
-      PhaseIterGVN *igvn = phase->is_IterGVN();
       DUIterator j;
       while(progress) {
         progress = false;