v8: replace Buffer with FastBuffer in deserialize

Replace the Buffer constructor with a FastBuffer in v8.deserialize in
order to avoid calling the Buffer constructor and thus triggering a
deprecation warning from code inside the core.

Fixes: #21181

PR-URL: #21196
Fixes: #21181
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/v8.js

@@ -143,7 +143,7 @@ const arrayBufferViewTypeToIndex = new Map();
   }
 }
 
-const bufferConstructorIndex = arrayBufferViewTypes.push(Buffer) - 1;
+const bufferConstructorIndex = arrayBufferViewTypes.push(FastBuffer) - 1;
 
 class DefaultSerializer extends Serializer {
   constructor() {

test/parallel/test-v8-deserialize-buffer.js

@@ -0,0 +1,8 @@
+// Flags: --pending-deprecation --no-warnings
+'use strict';
+
+const common = require('../common');
+const v8 = require('v8');
+
+process.on('warning', common.mustNotCall());
+v8.deserialize(v8.serialize(Buffer.alloc(0)));