--- old/src/hotspot/share/gc/shared/memset_with_concurrent_readers.hpp	2020-05-06 16:17:43.111876195 -0700
+++ new/src/hotspot/share/gc/shared/memset_with_concurrent_readers.hpp	2020-05-06 16:17:42.727868833 -0700
@@ -32,8 +32,6 @@
 
 // Fill a block of memory with value, like memset, but with the
 // understanding that there may be concurrent readers of that memory.
-void memset_with_concurrent_readers(void* to, int value, size_t size);
-
 inline void memset_with_concurrent_readers(void* to, int value, size_t size) {
   ::memset(to, value, size);
 }