8298301: C2: assert(main_cmp->in(2)->Opcode() == Op_Opaque1) failed: main loop has no opaque node?

Reviewed-by: thartmann

Author: chhagedorn

src/hotspot/share/opto/loopTransform.cpp

@@ -3576,9 +3576,9 @@ void IdealLoopTree::remove_main_post_loops(CountedLoopNode *cl, PhaseIdealLoop *
 
   // Remove the Opaque1Node of the pre loop and make it execute all iterations
   phase->_igvn.replace_input_of(pre_cmp, 2, pre_cmp->in(2)->in(2));
-  // Remove the Opaque1Node of the main loop so it can be optimized out
+  // Remove the OpaqueZeroTripGuardNode of the main loop so it can be optimized out
   Node* main_cmp = main_iff->in(1)->in(1);
-  assert(main_cmp->in(2)->Opcode() == Op_Opaque1, "main loop has no opaque node?");
+  assert(main_cmp->in(2)->Opcode() == Op_OpaqueZeroTripGuard, "main loop has no opaque node?");
   phase->_igvn.replace_input_of(main_cmp, 2, main_cmp->in(2)->in(1));
 }