[lld] Treat .openbsd.randomdata as read-only

From: Rui Ueyama <ruiu@google.com>
Date: Mon, 19 Dec 2016 20:08:59 -0600


Great. I don't have commit access, so it would be great if you could
commit this change for me.

Just realized that that I should have sent this to llvm-commits
instead. Apologies for that.

I have some further fixes. Is Phabricator preferred these days for
submitting patches?



Hi Mark,

committed with testcase r290174.
Yes, we usually use phab as it is convinent for doing reviews.