seraphime authored Jun 18, 2016 and Ben Gamari committed Jun 19, 2016

Fixes #10647. Changes the error message when a SIMD size
variable is required in the native code generation backend.

Test Plan:
Try compiling the test case given in the ticket :

{-# LANGUAGE MagicHash #-}
module Foo where
import GHC.Prim
data V = V Int8X16#

GHC should give a clearer error message

Reviewers: austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2325

GHC Trac Issues: #10647