--- a/src/hotspot/share/opto/matcher.cpp	Wed Nov 28 11:06:27 2018 +0100
+++ b/src/hotspot/share/opto/matcher.cpp	Wed Nov 28 13:24:56 2018 +0300
@@ -1208,9 +1208,7 @@
   // Allocate a private array of RegMasks.  These RegMasks are not shared.
   msfpt->_in_rms = NEW_RESOURCE_ARRAY( RegMask, cnt );
   // Empty them all.
-  for (uint i = 0; i < cnt; i++) {
-    msfpt->_in_rms[i] = RegMask();
-  }
+  for (uint i = 0; i < cnt; i++) ::new (&(msfpt->_in_rms[i])) RegMask();
 
   // Do all the pre-defined non-Empty register masks
   msfpt->_in_rms[TypeFunc::ReturnAdr] = _return_addr_mask;

--- a/src/hotspot/share/services/memoryManager.cpp	Wed Nov 28 11:06:27 2018 +0100
+++ b/src/hotspot/share/services/memoryManager.cpp	Wed Nov 28 13:24:56 2018 +0300
@@ -168,9 +168,8 @@
   _index = 0;
   _start_time = 0L;
   _end_time = 0L;
-  size_t len = _usage_array_size * sizeof(MemoryUsage);
-  memset(_before_gc_usage_array, 0, len);
-  memset(_after_gc_usage_array, 0, len);
+  for (int i = 0; i < _usage_array_size; i++) ::new (&_before_gc_usage_array[i]) MemoryUsage();
+  for (int i = 0; i < _usage_array_size; i++) ::new (&_after_gc_usage_array[i]) MemoryUsage();
 }