In case the requested permissions are kNoAccess, nothing needs to be
done as the mapping backing an AddressSpaceReservation is always
mapped kNoAccess. This fixes a performance regression on macOS.

Bug: chromium:1287599
Change-Id: I77d80489caf477e29434f9d0a06899746cb9403f
Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng,v8_linux_arm64_sim_heap_sandbox_dbg_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3398144Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Samuel Groß <saelo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78697}