Revert "Reland D147337 "[tsan] Add debugging interfaces into interface header.""

This broke the lit tests on Mac, see comment on the code review.

> This change the types to match the ones used in:
> Darwin/debug_external.cpp
> debugging.cpp
>
> Reviewed By: vitalybuka
>
> Differential Revision: https://reviews.llvm.org/D148214

This reverts commit ea7d6e65.