--- old/src/cpu/x86/vm/x86_32.ad	2019-08-28 12:02:30.000000000 -0700
+++ new/src/cpu/x86/vm/x86_32.ad	2019-08-28 12:02:30.000000000 -0700
@@ -1250,6 +1250,7 @@
 
 
   Unimplemented();
+  return 0; // Mute compiler
 }
 
 #ifndef PRODUCT