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

11 files changed, 22 insertions, 0 deletions

diff --git a/compiler/nativeGen/RegAlloc/Linear/Base.hs b/compiler/nativeGen/RegAlloc/Linear/Base.hs
index d4f124e297..1172870729 100644
--- a/compiler/nativeGen/RegAlloc/Linear/Base.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/Base.hs
@@ -17,6 +17,8 @@ module RegAlloc.Linear.Base (
 
 where
 
+import GhcPrelude
+
 import RegAlloc.Linear.StackMap
 import RegAlloc.Liveness
 import Reg
diff --git a/compiler/nativeGen/RegAlloc/Linear/FreeRegs.hs b/compiler/nativeGen/RegAlloc/Linear/FreeRegs.hs
index 9933f5bb49..b4e79432d8 100644
--- a/compiler/nativeGen/RegAlloc/Linear/FreeRegs.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/FreeRegs.hs
@@ -9,6 +9,8 @@ module RegAlloc.Linear.FreeRegs (
 
 where
 
+import GhcPrelude
+
 import Reg
 import RegClass
 
diff --git a/compiler/nativeGen/RegAlloc/Linear/JoinToTargets.hs b/compiler/nativeGen/RegAlloc/Linear/JoinToTargets.hs
index c262b2b059..89f496c409 100644
--- a/compiler/nativeGen/RegAlloc/Linear/JoinToTargets.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/JoinToTargets.hs
@@ -9,6 +9,8 @@
 --
 module RegAlloc.Linear.JoinToTargets (joinToTargets) where
 
+import GhcPrelude
+
 import RegAlloc.Linear.State
 import RegAlloc.Linear.Base
 import RegAlloc.Linear.FreeRegs
diff --git a/compiler/nativeGen/RegAlloc/Linear/Main.hs b/compiler/nativeGen/RegAlloc/Linear/Main.hs
index c13d02edb8..171ce88ef3 100644
--- a/compiler/nativeGen/RegAlloc/Linear/Main.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/Main.hs
@@ -102,6 +102,8 @@ module RegAlloc.Linear.Main (
 #include "HsVersions.h"
 
 
+import GhcPrelude
+
 import RegAlloc.Linear.State
 import RegAlloc.Linear.Base
 import RegAlloc.Linear.StackMap
diff --git a/compiler/nativeGen/RegAlloc/Linear/PPC/FreeRegs.hs b/compiler/nativeGen/RegAlloc/Linear/PPC/FreeRegs.hs
index 5d369249c7..581548212a 100644
--- a/compiler/nativeGen/RegAlloc/Linear/PPC/FreeRegs.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/PPC/FreeRegs.hs
@@ -2,6 +2,8 @@
 module RegAlloc.Linear.PPC.FreeRegs
 where
 
+import GhcPrelude
+
 import PPC.Regs
 import RegClass
 import Reg
diff --git a/compiler/nativeGen/RegAlloc/Linear/SPARC/FreeRegs.hs b/compiler/nativeGen/RegAlloc/Linear/SPARC/FreeRegs.hs
index db4d6ba376..653b2707c9 100644
--- a/compiler/nativeGen/RegAlloc/Linear/SPARC/FreeRegs.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/SPARC/FreeRegs.hs
@@ -3,6 +3,8 @@
 module RegAlloc.Linear.SPARC.FreeRegs
 where
 
+import GhcPrelude
+
 import SPARC.Regs
 import RegClass
 import Reg
diff --git a/compiler/nativeGen/RegAlloc/Linear/StackMap.hs b/compiler/nativeGen/RegAlloc/Linear/StackMap.hs
index 748fb98c30..95819c6fb3 100644
--- a/compiler/nativeGen/RegAlloc/Linear/StackMap.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/StackMap.hs
@@ -20,6 +20,8 @@ module RegAlloc.Linear.StackMap (
 
 where
 
+import GhcPrelude
+
 import DynFlags
 import UniqFM
 import Unique
diff --git a/compiler/nativeGen/RegAlloc/Linear/State.hs b/compiler/nativeGen/RegAlloc/Linear/State.hs
index 8b17d3ab88..6554188f41 100644
--- a/compiler/nativeGen/RegAlloc/Linear/State.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/State.hs
@@ -31,6 +31,8 @@ module RegAlloc.Linear.State (
 )
 where
 
+import GhcPrelude
+
 import RegAlloc.Linear.Stats
 import RegAlloc.Linear.StackMap
 import RegAlloc.Linear.Base
diff --git a/compiler/nativeGen/RegAlloc/Linear/Stats.hs b/compiler/nativeGen/RegAlloc/Linear/Stats.hs
index 71dedaeb55..66fd8742ba 100644
--- a/compiler/nativeGen/RegAlloc/Linear/Stats.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/Stats.hs
@@ -6,6 +6,8 @@ module RegAlloc.Linear.Stats (
 
 where
 
+import GhcPrelude
+
 import RegAlloc.Linear.Base
 import RegAlloc.Liveness
 import Instruction
diff --git a/compiler/nativeGen/RegAlloc/Linear/X86/FreeRegs.hs b/compiler/nativeGen/RegAlloc/Linear/X86/FreeRegs.hs
index ae4aa53254..65a566d1c3 100644
--- a/compiler/nativeGen/RegAlloc/Linear/X86/FreeRegs.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/X86/FreeRegs.hs
@@ -3,6 +3,8 @@
 module RegAlloc.Linear.X86.FreeRegs
 where
 
+import GhcPrelude
+
 import X86.Regs
 import RegClass
 import Reg
diff --git a/compiler/nativeGen/RegAlloc/Linear/X86_64/FreeRegs.hs b/compiler/nativeGen/RegAlloc/Linear/X86_64/FreeRegs.hs
index 5a7f71e3f0..713b053356 100644
--- a/compiler/nativeGen/RegAlloc/Linear/X86_64/FreeRegs.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/X86_64/FreeRegs.hs
@@ -3,6 +3,8 @@
 module RegAlloc.Linear.X86_64.FreeRegs
 where
 
+import GhcPrelude
+
 import X86.Regs
 import RegClass
 import Reg