diff -r fdb992d83a87 -r 11211f7cb5a0 src/share/vm/opto/block.cpp
--- a/src/share/vm/opto/block.cpp	Tue Aug 16 04:14:05 2011 -0700
+++ b/src/share/vm/opto/block.cpp	Tue Aug 16 11:53:57 2011 -0700
@@ -839,7 +839,7 @@
 
       // Make sure we TRUE branch to the target
       if( proj0->Opcode() == Op_IfFalse ) {
-        iff->negate();
+        iff->as_MachIf()->negate();
       }
 
       b->_nodes.pop();          // Remove IfFalse & IfTrue projections