- Changes POSIX version of OS::SetPermissions to ignore the result of
  ReclaimInaccessibleMemory instead of returning it as the result.

Bug: v8:7923
Change-Id: I70f4b81f6ccada997e2da4d4a521ffe069260bec
Reviewed-on: https://chromium-review.googlesource.com/1140678Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54619}