TcPatSyn: Fix spelling of "pattern" in error message
TcPatSyn: Fix spelling of "pattern" in error message

(cherry picked from commit 99cb627a45afacde5f86799671c53baf81daee41)

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