v8: Remove extra slashes

Change-Id: Ib5d2e24ee4a83547b9d403d5d8b5d75173b8310b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3648093Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Solomon Kinard <solomonkinard@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80597}

test/mjsunit/regress/regress-619382.js

 // Copyright 2016 the V8 project authors. All rights reserved.
-// // Use of this source code is governed by a BSD-style license that can be
-// // found in the LICENSE file.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 //
-// // Flags: --expose-gc --always-turbofan
+// Flags: --expose-gc --always-turbofan
 
 (function __f_9() {
 })();