--- a/src/hotspot/cpu/aarch64/register_aarch64.hpp	Tue Oct 08 15:30:46 2019 +0200
+++ b/src/hotspot/cpu/aarch64/register_aarch64.hpp	Wed Oct 09 12:30:06 2019 +0000
@@ -230,6 +230,11 @@
     return *this;
   }
 
+  RegSet &operator-=(const RegSet aSet) {
+    *this = *this - aSet;
+    return *this;
+  }
+
   static RegSet of(Register r1) {
     return RegSet(r1);
   }