Clean up rtAliasP
Clean up rtAliasP

The 'reserved' and 'reservedOp' usage should now properly sort out surrounding
whitespace.

ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell