--- old/src/share/vm/opto/matcher.cpp	2015-09-14 15:54:43.189892890 +0200
+++ new/src/share/vm/opto/matcher.cpp	2015-09-14 15:54:43.009892881 +0200
@@ -2022,7 +2022,7 @@
 // Set bits if Node is shared or otherwise a root
 void Matcher::find_shared( Node *n ) {
   // Allocate stack of size C->unique() * 2 to avoid frequent realloc
-  MStack mstack(C->unique() * 2);
+  MStack mstack(C->live_nodes() * 2);
   // Mark nodes as address_visited if they are inputs to an address expression
   VectorSet address_visited(Thread::current()->resource_area());
   mstack.push(n, Visit);     // Don't need to pre-visit root node