Ben Gamari authored Nov 29, 2016 and Ben Gamari committed Nov 29, 2016

Consider the case of building a stage1 compiler. `hschooks.c` will be
built by stage0 `ghc` and linked against the `stage0` RTS. Despite this
it was #including the stage1 `Rts.h`. There is, of course, no guarantee
that this is ABI-compatible with the stage0 RTS and when they diverge
Bad Things happen (e.g. bells ringing at inappropriate times in D2699).

Test Plan: Validate

Reviewers: simonmar, austin

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2763