[llvm] r317626 - Fix build bots after r317622

[Davide Italiano via llvm-commits]

On Tue, Nov 7, 2017 at 2:37 PM, Craig Topper via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
> This wil always return 0 in a release build. Is that what you want? Or
> should it be calling lookup in release builds?
>

This is definitely not right. The right fix here is to hoist the
lookup function outside of the assertion to make sure it
doesn't get stripped in builds without assertions.
Thanks for reverting.

--
Davide