[handles] Do not zap new blocks for local handles

Not needed in order to prevent use-after-frees.

Bug: v8:10315
Change-Id: I7713b2fb39681bb88e60fc7cc417b40430f0c73c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2326031Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69175}

src/handles/local-handles.cc

@@ -54,9 +54,6 @@ bool LocalHandles::Contains(Address* location) {
 Address* LocalHandles::AddBlock() {
   DCHECK_EQ(scope_.next, scope_.limit);
   Address* block = NewArray<Address>(kHandleBlockSize);
-#ifdef ENABLE_HANDLE_ZAPPING
-  ZapRange(block, block + kHandleBlockSize);
-#endif
   blocks_.push_back(block);
   scope_.next = block;
   scope_.limit = block + kHandleBlockSize;