Moritz Angermann authored Sep 21, 2017 and Ben Gamari committed Sep 21, 2017

In 8b007abb (nativeGen: Consistently use blockLbl to generate
CLabels from BlockIds) all blockLbls were changed. This interfered with
the `toInfoLbl` call in CmmProcPoint, and caused the LLVM backend to
fall over.

Reviewers: bgamari, austin, simonmar

Reviewed By: bgamari

Subscribers: rwbarton, thomie

Differential Revision: https://phabricator.haskell.org/D4006