8331733: [PPC64] saving and restoring CR is not needed at most places

src/hotspot/cpu/ppc/gc/shared/barrierSetAssembler_ppc.cpp

@@ -342,7 +342,7 @@ int SaveLiveRegisters::iterate_over_register_mask(IterationAction action, int of
         }
       }
     } else if (vm_reg->is_ConditionRegister()) {
-      ShouldNotReachHere(); // live condition registers are unexpected at this point
+      // NOP. Conditions registers are covered by save_LR_CR
     } else if (vm_reg->is_VectorSRegister()) {
       assert(SuperwordUseVSX, "or should not reach here");
       VectorSRegister vs_reg = vm_reg->as_VectorSRegister();

src/hotspot/cpu/ppc/gc/x/xBarrierSetAssembler_ppc.cpp

@@ -479,7 +479,7 @@ class XSaveLiveRegisters {
           }
         }
       } else if (vm_reg->is_ConditionRegister()) {
-        ShouldNotReachHere(); // live condition registers are unexpected at this point.
+        // NOP. Conditions registers are covered by save_LR_CR
       } else if (vm_reg->is_VectorSRegister()) {
         assert(SuperwordUseVSX, "or should not reach here");
         VectorSRegister vs_reg = vm_reg->as_VectorSRegister();