Revert r351311 "[OMPT] Make sure that OMPT is enabled when accessing internals of the runtime"

and also the follow-up r351315.

The new test is failing on the buildbots.

> Make sure that OMPT is enabled in runtime entry points that access internals
> of the runtime. Else, return an appropiate value indicating an error or that
> the data is not available.
>
> Patch provided by @sconvent
>
> Reviewers: jlpeyton, omalyshe, hbae, Hahnfeld, joachim.protze
>
> Reviewed By: joachim.protze
>
> Tags: #openmp, #ompt
>
> Differential Revision: https://reviews.llvm.org/D47717

llvm-svn: 351431