deps: V8: cherry-pick edeb0a4fa181

Original commit message:

    Zero-initialize proxy padding

    So that snapshots with proxies can be reproducible.

    Refs: nodejs#61898
    Change-Id: I01fac5e18c73cd482a1ae63750dbadf42a12e08a
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/7666243
    Reviewed-by: Jakob Kummerow <[email protected]>
    Commit-Queue: Joyee Cheung <[email protected]>
    Cr-Commit-Position: refs/heads/main@{#105830}

Refs: v8/v8@edeb0a4

Author: joyeecheung

common.gypi

@@ -40,7 +40,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.8',
+    'v8_embedder_string': '-node.9',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/src/builtins/builtins-proxy-gen.cc

@@ -63,6 +63,10 @@ TNode<JSProxy> ProxiesCodeStubAssembler::AllocateProxy(
   StoreObjectFieldNoWriteBarrier(proxy, JSProxy::kTargetOffset, target);
   StoreObjectFieldNoWriteBarrier(proxy, JSProxy::kHandlerOffset, handler);
   StoreObjectFieldNoWriteBarrier(proxy, JSProxy::kFlagsOffset, flags);
+#if TAGGED_SIZE_8_BYTES
+  StoreObjectFieldNoWriteBarrier(proxy, JSProxy::kPaddingOffset,
+                                 Int32Constant(0));
+#endif
 
   return CAST(proxy);
 }

deps/v8/src/heap/factory.cc

@@ -3946,6 +3946,9 @@ Handle<JSProxy> Factory::NewJSProxy(DirectHandle<JSReceiver> target,
   result->set_target(*target, SKIP_WRITE_BARRIER);
   result->set_handler(*handler, SKIP_WRITE_BARRIER);
   result->set_flags(JSProxy::IsRevocableBit::encode(revocable));
+#if TAGGED_SIZE_8_BYTES
+  result->set_padding(0);
+#endif
   return handle(result, isolate());
 }