ARM support significantly more stable as of GHC 8.0.1

[m-renaud]

GHC 8.0.1 fixes the "ARM is generally a disaster" bug (https://ghc.haskell.org/trac/ghc/ticket/11206). This doesn't address all of the issues that you mention but it's a huge step forward. Not sure if it brings it into the "Mature" category but at least into "Borderline Mature". What do you think?

[Gabriella439]

Generally I know nothing about development on ARM, but I'll accept any pull request from somebody who has gotten GHC working on ARM. I don't feel comfortable writing it up myself because I don't have an ARM platform to test on