--- old/src/hotspot/cpu/ppc/c1_LIRGenerator_ppc.cpp	2018-04-29 18:10:16.058512796 -0400
+++ new/src/hotspot/cpu/ppc/c1_LIRGenerator_ppc.cpp	2018-04-29 18:10:14.618429630 -0400
@@ -1068,7 +1068,7 @@
 void LIRGenerator::do_CheckCast(CheckCast* x) {
   LIRItem obj(x->obj(), this);
   CodeEmitInfo* patching_info = NULL;
-  if (!x->klass()->is_loaded() || (PatchALot && !x->is_incompatible_class_change_check())) {
+  if (!x->klass()->is_loaded() || (PatchALot && !x->is_incompatible_class_change_check() && !x->is_invokespecial_receiver_check())) {
     // Must do this before locking the destination register as
     // an oop register, and before the obj is loaded (so x->obj()->item()
     // is valid for creating a debug info location).