[web snapshot] Mark flag as experimental

This CL renames the --d8-web-snapshot-api flag to explicitly mark it as
experimental, so that it is ignored by fuzzers.

Bug: v8:11525, v8:11706
Change-Id: Iff8a9d5697b60d0ade841773d1f0b537fcb19b70
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2922109Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Vicky Kontoura <vkont@google.com>
Cr-Commit-Position: refs/heads/master@{#74820}

src/d8/d8.cc

@@ -4255,7 +4255,7 @@ bool Shell::SetOptions(int argc, char* argv[]) {
     } else if (strncmp(argv[i], "--web-snapshot-config=", 22) == 0) {
       options.web_snapshot_config = argv[i] + 22;
       argv[i] = nullptr;
-    } else if (strcmp(argv[i], "--d8-web-snapshot-api") == 0) {
+    } else if (strcmp(argv[i], "--experimental-d8-web-snapshot-api") == 0) {
       options.d8_web_snapshot_api = true;
       argv[i] = nullptr;
     } else if (strcmp(argv[i], "--compile-only") == 0) {

src/d8/d8.h

@@ -410,8 +410,8 @@ class ShellOptions {
       "enable-system-instrumentation", false};
   DisallowReassignment<const char*> web_snapshot_config = {
       "web-snapshot-config", nullptr};
-  DisallowReassignment<bool> d8_web_snapshot_api = {"d8-web-snapshot-api",
-                                                    false};
+  DisallowReassignment<bool> d8_web_snapshot_api = {
+      "experimental-d8-web-snapshot-api", false};
   DisallowReassignment<bool> compile_only = {"compile-only", false};
   DisallowReassignment<int> repeat_compile = {"repeat-compile", 1};
 };

test/mjsunit/web-snapshot/web-snapshot.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --d8-web-snapshot-api
+// Flags: --experimental-d8-web-snapshot-api
 
 function callString(f) {
     return '(' + f.toString() + ')()';