diff -r 73395f9cad54 -r 3868dde58ebb src/hotspot/share/classfile/classLoaderData.cpp
--- a/src/hotspot/share/classfile/classLoaderData.cpp	Tue Jul 02 12:24:26 2019 +0200
+++ b/src/hotspot/share/classfile/classLoaderData.cpp	Mon Jun 10 13:04:12 2019 +0200
@@ -266,6 +266,19 @@
 }
 #endif // PRODUCT
 
+void ClassLoaderData::clear_claim(int claim) {
+  for (;;) {
+    int old_claim = Atomic::load(&_claim);
+    if ((old_claim & claim) == 0) {
+      return;
+    }
+    int new_claim = old_claim & ~claim;
+    if (Atomic::cmpxchg(new_claim, &_claim, old_claim) == old_claim) {
+      return;
+    }
+  }
+}
+
 bool ClassLoaderData::try_claim(int claim) {
   for (;;) {
     int old_claim = Atomic::load(&_claim);