Refactor: delete most of the module FastTypes

This reverses some of the work done in #1405, and goes back to the
assumption that the bootstrap compiler understands GHC-haskell.

In particular:
  * use MagicHash instead of _ILIT and _CLIT
  * pattern matching on I# if possible, instead of using iUnbox
    unnecessarily
  * use Int#/Char#/Addr# instead of the following type synonyms:
    - type FastInt   = Int#
    - type FastChar  = Char#
    - type FastPtr a = Addr#
  * inline the following functions:
    - iBox           = I#
    - cBox           = C#
    - fastChr        = chr#
    - fastOrd        = ord#
    - eqFastChar     = eqChar#
    - shiftLFastInt  = uncheckedIShiftL#
    - shiftR_FastInt = uncheckedIShiftRL#
    - shiftRLFastInt = uncheckedIShiftRL#
  * delete the following unused functions:
    - minFastInt
    - maxFastInt
    - uncheckedIShiftRA#
    - castFastPtr
    - panicDocFastInt and pprPanicFastInt
  * rename panicFastInt back to panic#

These functions remain, since they actually do something:
  * iUnbox
  * bitAndFastInt
  * bitOrFastInt

Test Plan: validate

Reviewers: austin, bgamari

Subscribers: rwbarton

Differential Revision: https://phabricator.haskell.org/D1141

GHC Trac Issues: #1405

1 files changed, 1 insertions, 2 deletions

diff --git a/compiler/main/GhcPlugins.hs b/compiler/main/GhcPlugins.hs
index 2b7746c6ce..2326ebdf6c 100644
--- a/compiler/main/GhcPlugins.hs
+++ b/compiler/main/GhcPlugins.hs
@@ -19,7 +19,7 @@ module GhcPlugins(
         module VarSet, module VarEnv, module NameSet, module NameEnv, 
         module UniqSet, module UniqFM, module FiniteMap,
         module Util, module Serialized, module SrcLoc, module Outputable, 
-        module UniqSupply, module Unique, module FastString, module FastTypes
+        module UniqSupply, module Unique, module FastString
     ) where
 
 -- Plugin stuff itself
@@ -81,4 +81,3 @@ import Outputable
 import UniqSupply
 import Unique           ( Unique, Uniquable(..) )
 import FastString
-import FastTypes