Add (a) CoreM monad, (b) new Annotations feature

This patch, written by Max Bolingbroke,  does two things

1.  It adds a new CoreM monad (defined in simplCore/CoreMonad),
    which is used as the top-level monad for all the Core-to-Core
    transformations (starting at SimplCore).  It supports
       * I/O (for debug printing)
       * Unique supply
       * Statistics gathering
       * Access to the HscEnv, RuleBase, Annotations, Module
    The patch therefore refactors the top "skin" of every Core-to-Core
    pass, but does not change their functionality.

2.  It adds a completely new facility to GHC: Core "annotations".
    The idea is that you can say
       {#- ANN foo (Just "Hello") #-}
    which adds the annotation (Just "Hello") to the top level function
    foo.  These annotations can be looked up in any Core-to-Core pass,
    and are persisted into interface files.  (Hence a Core-to-Core pass
    can also query the annotations of imported things.)  Furthermore,
    a Core-to-Core pass can add new annotations (eg strictness info)
    of its own, which can be queried by importing modules.

The design of the annotation system is somewhat in flux.  It's
designed to work with the (upcoming) dynamic plug-ins mechanism,
but is meanwhile independently useful.

Do not merge to 6.10!  

1 files changed, 2 insertions, 10 deletions

diff --git a/compiler/simplCore/CSE.lhs b/compiler/simplCore/CSE.lhs
index 1386197eba..8b5825bf6a 100644
--- a/compiler/simplCore/CSE.lhs
+++ b/compiler/simplCore/CSE.lhs
@@ -10,14 +10,12 @@ module CSE (
 
 #include "HsVersions.h"
 
-import DynFlags	( DynFlag(..), DynFlags )
 import Id		( Id, idType, idInlinePragma, zapIdOccInfo )
 import CoreUtils	( hashExpr, cheapEqExpr, exprIsBig, mkAltExpr, exprIsCheap )
 import DataCon		( isUnboxedTupleCon )
 import Type		( tyConAppArgs )
 import CoreSyn
 import VarEnv	
-import CoreLint		( showPass, endPass )
 import Outputable
 import StaticFlags	( opt_PprStyle_Debug )
 import BasicTypes	( isAlwaysActive )
@@ -178,14 +176,8 @@ happen now that we don't look inside INLINEs (which wrappers are).
 %************************************************************************
 
 \begin{code}
-cseProgram :: DynFlags -> [CoreBind] -> IO [CoreBind]
-
-cseProgram dflags binds
-  = do {
-	showPass dflags "Common sub-expression";
-	let { binds' = cseBinds emptyCSEnv binds };
-	endPass dflags "Common sub-expression" 	Opt_D_dump_cse binds'	
-    }
+cseProgram :: [CoreBind] -> [CoreBind]
+cseProgram binds = cseBinds emptyCSEnv binds
 
 cseBinds :: CSEnv -> [CoreBind] -> [CoreBind]
 cseBinds _   []     = []