Build debugged prof runtimes
Build debugged prof runtimes

For some reason these were disabled. I find these quite useful when
debugging profiling issues, so enable them again.

Reviewers: bgamari, simonmar

Reviewed By: simonmar

Subscribers: rwbarton, carter

Differential Revision: https://phabricator.haskell.org/D5140

sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc