8292312: Work around memset() called operator new

Reviewed-by: dcubed

src/hotspot/share/runtime/synchronizer.cpp

@@ -78,7 +78,7 @@ void ObjectMonitorsHashtable::add_entry(void* key, ObjectMonitor* om) {
   ObjectMonitorsHashtable::PtrList* list = get_entry(key);
   if (list == nullptr) {
     // Create new list and add it to the hash table:
-    list = new (ResourceObj::C_HEAP, mtThread) ObjectMonitorsHashtable::PtrList();
+    list = new (ResourceObj::C_HEAP, mtThread) ObjectMonitorsHashtable::PtrList;
     add_entry(key, list);
   }
   list->add(om);  // Add the ObjectMonitor to the list.

src/hotspot/share/runtime/synchronizer.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -66,7 +66,7 @@ class ObjectMonitorsHashtable {
   // ResourceHashtable is passed to various functions and populated in
   // different places so we allocate it using C_HEAP to make it immune
   // from any ResourceMarks that happen to be in the code paths.
-  ObjectMonitorsHashtable() : _ptrs(new (ResourceObj::C_HEAP, mtThread) PtrTable()), _key_count(0), _om_count(0) {}
+  ObjectMonitorsHashtable() : _ptrs(new (ResourceObj::C_HEAP, mtThread) PtrTable), _key_count(0), _om_count(0) {}
 
   ~ObjectMonitorsHashtable();
 

src/hotspot/share/utilities/resourceHash.hpp

@@ -26,6 +26,7 @@
 #define SHARE_UTILITIES_RESOURCEHASH_HPP
 
 #include "memory/allocation.hpp"
+#include "utilities/globalDefinitions.hpp"
 #include "utilities/numberSeq.hpp"
 #include "utilities/tableStatistics.hpp"
 
@@ -289,7 +290,7 @@ class FixedResourceHashtableStorage : public ResourceObj {
 
   Node* _table[TABLE_SIZE];
 protected:
-  FixedResourceHashtableStorage() : _table() {}
+  FixedResourceHashtableStorage() { memset(_table, 0, sizeof(_table)); }
   ~FixedResourceHashtableStorage() = default;
 
   constexpr unsigned table_size() const {