--- a/src/hotspot/share/c1/c1_InstructionPrinter.cpp	Wed Oct 03 11:43:39 2018 +0530
+++ b/src/hotspot/share/c1/c1_InstructionPrinter.cpp	Wed Oct 03 03:41:57 2018 -0400
@@ -918,18 +918,16 @@
 }
 
 void InstructionPrinter::do_MemBar(MemBar* x) {
-  if (os::is_MP()) {
-    LIR_Code code = x->code();
-    switch (code) {
-      case lir_membar_acquire   : output()->print("membar_acquire"); break;
-      case lir_membar_release   : output()->print("membar_release"); break;
-      case lir_membar           : output()->print("membar"); break;
-      case lir_membar_loadload  : output()->print("membar_loadload"); break;
-      case lir_membar_storestore: output()->print("membar_storestore"); break;
-      case lir_membar_loadstore : output()->print("membar_loadstore"); break;
-      case lir_membar_storeload : output()->print("membar_storeload"); break;
-      default                   : ShouldNotReachHere(); break;
-    }
+  LIR_Code code = x->code();
+  switch (code) {
+  case lir_membar_acquire   : output()->print("membar_acquire"); break;
+  case lir_membar_release   : output()->print("membar_release"); break;
+  case lir_membar           : output()->print("membar"); break;
+  case lir_membar_loadload  : output()->print("membar_loadload"); break;
+  case lir_membar_storestore: output()->print("membar_storestore"); break;
+  case lir_membar_loadstore : output()->print("membar_loadstore"); break;
+  case lir_membar_storeload : output()->print("membar_storeload"); break;
+  default                   : ShouldNotReachHere(); break;
   }
 }