Fixed zapping of contents

src/zone/zone.cc

Index: src/zone/zone.cc
diff --git a/src/zone/zone.cc b/src/zone/zone.cc
index 91506dd6d206fbba28653483de5beca4011cc9d5..a43aea5bb7ca8e82adb6d13c910be107beb50027 100644
--- a/src/zone/zone.cc
+++ b/src/zone/zone.cc
@@ -112,9 +112,8 @@ void Zone::DeleteAll() {
 #ifdef DEBUG
       // Un-poison first so the zapping doesn't trigger ASan complaints.
       ASAN_UNPOISON_MEMORY_REGION(current, size);
-      // Zap the entire current segment (including the header).
-      memset(current, kZapDeadByte, size);
 #endif
+      current->ZapContents();
       segment_bytes_allocated_ -= size;
       allocator_->FreeSegment(current);
     }
@@ -131,10 +130,7 @@ void Zone::DeleteAll() {
     limit_ = keep->end();
     // Un-poison so we can re-use the segment later.
     ASAN_UNPOISON_MEMORY_REGION(start, keep->capacity());
-#ifdef DEBUG
-    // Zap the contents of the kept segment (but not the header).
-    memset(start, kZapDeadByte, keep->capacity());
-#endif
+    keep->ZapContents();
   } else {
     position_ = limit_ = 0;
   }