tmcgilchrist authored Oct 01, 2016 and Ben Gamari committed Oct 01, 2016

The user guide says that we allow the user to use `specialise` or
`specialize` interchangeably but this wasn't the case for the relevant
flags. This patch adds aliases for the flags which control
specialisation.

Reviewers: erikd, austin, mpickering, bgamari

Reviewed By: mpickering, bgamari

Subscribers: mpickering, thomie

Differential Revision: https://phabricator.haskell.org/D2542

GHC Trac Issues: #12575