Orderfile: skip madvise if ordering has not been done.

Change a CHECK to an logged warning if madvise is attempted when code
ordering has not been performed. This happens on upstream builds
including arm64 builds.

Bug: 894748
Change-Id: Icdb7ae0c94cfad5beec0215c6186e29135c1079a
Reviewed-on: https://chromium-review.googlesource.com/c/1278746
Reviewed-by: Egor Pasko <pasko@chromium.org>
Reviewed-by: Matthew Cary <mattcary@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599201}
1 file changed