[sandbox] Enable sandboxed pointers on Desktop

Bug: chromium:1218005
Change-Id: I3df750ee9101779952d8b1ae630c4d3b7563084b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3578645Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Samuel Groß <saelo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80376}

BUILD.gn

@@ -501,6 +501,11 @@ if (v8_enable_sandbox == "") {
       v8_enable_external_code_space
 }
 
+# Enable sandboxed pointers on desktop when the sandbox is enabled.
+if (v8_enable_sandbox && !is_android && !is_fuchsia) {
+  v8_enable_sandboxed_pointers = true
+}
+
 # Enable all available sandbox features if sandbox future is enabled.
 if (v8_enable_sandbox_future) {
   v8_enable_sandboxed_pointers = true