Add deepseq dependency and a few NFData instances

I needed to rnf a data structure (CompiledByteCode) but we don't have
any good deepseq infrastructure in the compiler yet.  There are bits and
pieces, but nothing consistent, so this is a start.

We already had a dependency on deepseq indirectly via other packages
(e.g. containers).

Includes an update to the haddock submodule, to remove orphan NFData
instances in there.

Test Plan: validate

Reviewers: austin, bgamari, erikd, hvr

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2418

1 files changed, 4 insertions, 1 deletions

diff --git a/compiler/utils/FastString.hs b/compiler/utils/FastString.hs
index 651719a65a..1496a8686e 100644
--- a/compiler/utils/FastString.hs
+++ b/compiler/utils/FastString.hs
@@ -1,6 +1,7 @@
 -- (c) The University of Glasgow, 1997-2006
 
-{-# LANGUAGE BangPatterns, CPP, MagicHash, UnboxedTuples #-}
+{-# LANGUAGE BangPatterns, CPP, MagicHash, UnboxedTuples,
+    GeneralizedNewtypeDeriving #-}
 {-# OPTIONS_GHC -O -funbox-strict-fields #-}
 -- We always optimise this, otherwise performance of a non-optimised
 -- compiler is severely affected
@@ -97,6 +98,7 @@ import FastFunctions
 import Panic
 import Util
 
+import Control.DeepSeq
 import Control.Monad
 import Data.ByteString (ByteString)
 import qualified Data.ByteString          as BS
@@ -145,6 +147,7 @@ hashByteString bs
 -- -----------------------------------------------------------------------------
 
 newtype FastZString = FastZString ByteString
+  deriving NFData
 
 hPutFZS :: Handle -> FastZString -> IO ()
 hPutFZS handle (FastZString bs) = BS.hPut handle bs