--- old/src/hotspot/share/gc/shared/memAllocator.cpp	2019-07-08 17:19:16.270723129 +0000
+++ new/src/hotspot/share/gc/shared/memAllocator.cpp	2019-07-08 17:19:15.998722848 +0000
@@ -375,12 +375,13 @@
   return obj;
 }
 
-void MemAllocator::mem_clear(HeapWord* mem) const {
+HeapWord* MemAllocator::mem_clear(HeapWord* mem) const {
   assert(mem != NULL, "cannot initialize NULL object");
   const size_t hs = oopDesc::header_size();
   assert(_word_size >= hs, "unexpected object size");
   oopDesc::set_klass_gap(mem, 0);
   Copy::fill_to_aligned_words(mem + hs, _word_size - hs);
+  return mem;
 }
 
 oop MemAllocator::finish(HeapWord* mem) const {
@@ -399,7 +400,7 @@
 }
 
 oop ObjAllocator::initialize(HeapWord* mem) const {
-  mem_clear(mem);
+  mem = mem_clear(mem);
   return finish(mem);
 }
 
@@ -418,7 +419,7 @@
   // concurrent GC.
   assert(_length >= 0, "length should be non-negative");
   if (_do_zero) {
-    mem_clear(mem);
+    mem = mem_clear(mem);
   }
   arrayOopDesc::set_length(mem, _length);
   return finish(mem);
@@ -429,7 +430,7 @@
   // non-NULL _klass field indicates that the object is parsable by
   // concurrent GC.
   assert(_word_size > 0, "oop_size must be positive.");
-  mem_clear(mem);
+  mem = mem_clear(mem);
   java_lang_Class::set_oop_size(mem, (int)_word_size);
   return finish(mem);
 }