Bring up to 4.02 interface file syntax

Make it only a warning if you have a type like this:

	forall a. Int -> Int

These show up in interface files occasionally, just because
the simplifier is a bit blase about adding type arguments.

But it's an error to have

	forall a. Eq a => Int -> Int

The flag -fwarn-unused-matches reports a warning for these
redundant for-alls.

Remove a couple of stgcasts.

Specialise STATIC_LINK() for {FUN,THUNK,IND}_STATIC.

Reduce alignment for info tables on x86 to 1 word.  It was previously
4 words, which meant that the entry code was wrongly aligned all the
time (because info tables are either 2 or 3 words).  At least this way
we've got a 1 in 4 chance of being properly aligned.

Remove flags field from info tables; create a separate table of flags
indexed by the closure type in the RTS.

Make clear in HsType whether a for-all is explicit
in the source program or not.  Implicit for-alls now
look like 
	HsForAllTy Nothing ctxt ty
while explicit ones look like
	HsForAllTy (Just tvs) ctxt ty

Before this, the scope analysis stuff in RnSource was
actually wrong (not that anyone had noticed), but Alex Ferguson
did notice a bogus (sort-of-duplicate) error message on types
like
	f :: Eq a => Int -> Int
which led me to spot the deeper problem.  Anyway, it's all 
cool now.

Move mkdependHS to lib.

Fix loadInterface to avoid repeated loading of PrelPack.hi-boot

Save a few bytes by ommitting the static link field on closures with
an empty SRT.

HPUX fixes.

Pass -fcompiling-prelude through.

-fcompiling-prelude is back!

When compiling the Prelude we need to distinguish between wired-in
module references that are DLL-bound or not. (Just having -static
didn't cut it in the end, since it also encompasses RTS references.)

On platforms that don't use Win32 DLLs, Preludes compiled with and
without -fcompiling-prelude will be observationally equivalent.

Fix a small bug in weak ptr support.

After 'make install' has completed, make sure we regenerate the
script in a state that's useable.

Last commit made empty where bodies illegal, i.e.,

  x = 2 where

Re-added support for this "feature".

Some Haskell98-related regression tests

Neural network regression test app; contains painfully long list of
constants.

Put mkdependHS in libexecdir, not bindir.

Now lives in ghc/interpreter/lib, along with other libraries.

Handle CAF_UNENTERED (ie, reverted) in scavenge_mut_once_list

Many improvements resulting from first attempt to run nofib suite:
-- More libraries (lib/*.hs) brought into operation
-- Prelude error handling and basic I/O improved
-- Changed bytecode immediate value fields so large constant
--   tables can be compiled
-- Fixed bugs: translation of FATBAR, negative floating point
--   literals, strict constructors, handling of CAFs

#ifdeffery to make it work with interpreter.

Include CAF_ENTEREDs on the mutables list so they get scavenged correctly.

Fix bug in mkRegLiveness causing bogus heap checks to be generated on the Sparc.

docfix

enlargeStablePtrTable: initialise the whole table (incl. index 0) the first
time around.

s/show/showSDoc/

Discovered-by: removing instance Show (->) :-)

More counters reinstated; this should be the lot now:
  ENT_AP_UPD_ctr, ENT_BH_ctr, RET_UNBOXED_TUP_ctr, RET_UNBOXED_TUP_hst[]

Counter UPD_PAP_IN_PLACE_ctr erroneously missed from raw Ticky dump.

Support for unsafely thawing your (Byte)Arrays, i.e., added the
following ops:

 MutableArray.unsafeThawArray :: Ix ix => Array ix elt -> ST s (MutableArray s ix elt)
 MutableArray.unsafeThawByteArray :: Ix ix => ByteArray ix -> ST s (MutableByteArray s ix)
 MutableArray.thawByteArray :: Ix ix => ByteArray ix -> ST s (MutableByteArray s ix)

 ST.unsafeThawSTArray 	    :: Ix ix => Array ix elt -> ST s (STArray s ix elt)
 LazyST.unsafeThawSTArray   :: Ix ix => Array ix elt -> ST s (STArray s ix elt)

 IOExts.unsafeFreezeIOArray :: Ix ix => IOArray ix elt -> IO (Array ix elt)
 IOExts.unsafeThawIOArray   :: Ix ix => Array ix elt -> IO (IOArray ix elt)

+ removed the re-exportation of Monad that ST and LazyST did.

Remove the Show instance for (a->b). It will not be missed..

Top-level non-updatable thunks get closure type FUN_STATIC, not
THUNK_STATIC.  (helps the garbage collector decide where the static
link field should be).

Make type substitution strict.  This partially fixes the space leak,
and seems to improve performance marginally.

more cygwin tweakage, this time for b19

Previous mingw32 related commit upset things on the cygwin side.

Amalgamated pp.c into stg.c.

DLL_IMPORT_DATA_VAR fix

Define HEAP_ALLOCED macro in non Win32 DLL land too

COMPILING_RTS is now defined when compiling the rts. It is used for
the following:

 - the contents of includes/Prelude.h is only visible when COMPILING_RTS
   is on.
 - getting the DLLIMPORT declarations right on various labels defined by
   the Prelude or the RTS.