Ensure T9646 dump-simpl output is cleaned
Ensure T9646 dump-simpl output is cleaned

(cherry picked from commit da3b29bd1768d717753b7d1642e0e4e97750ae7b)

GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc