The two jump tables (near and far jump table) are usually allocated next
to each other, so we can switch permissions for both in a single system
call.
This removes one of the three to four remaining system calls in
deserialization.

R=jkummerow@chromium.org

Bug: v8:11974, chromium:1297999
Change-Id: I68d2bd1c2e68bea46ebac4e01906915ff5a1d3bd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3472075Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79197}