compiler: introduce custom "GhcPrelude" Prelude

This switches the compiler/ component to get compiled with
-XNoImplicitPrelude and a `import GhcPrelude` is inserted in all
modules.

This is motivated by the upcoming "Prelude" re-export of
`Semigroup((<>))` which would cause lots of name clashes in every
modulewhich imports also `Outputable`

Reviewers: austin, goldfire, bgamari, alanz, simonmar

Reviewed By: bgamari

Subscribers: goldfire, rwbarton, thomie, mpickering, bgamari

Differential Revision: https://phabricator.haskell.org/D3989

1 files changed, 2 insertions, 0 deletions

diff --git a/compiler/iface/TcIface.hs b/compiler/iface/TcIface.hs
index d17e2351e3..8633658dd9 100644
--- a/compiler/iface/TcIface.hs
+++ b/compiler/iface/TcIface.hs
@@ -22,6 +22,8 @@ module TcIface (
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import TcTypeNats(typeNatCoAxiomRules)
 import IfaceSyn
 import LoadIface