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

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

When putting the RTS in a DLL, we have to delay filling in the
Charlike and Intlike tables until load-time.

- s/finalise/finalize/g
- make finalize run the finalizer immediately, and wait for its completion
- make mkWeak take a (Maybe (IO ())) for the finalizer argument
- remove mkWeakNoFinalizer

Copyright police.

Remove MUT_ARR_WORDS.  I'm not sure why we had it in the first place.

- Add ticky counter for total bytes copied during GC.
- Separate mutable list into two lists, a "mut once" list for
  old generation indirections and MUT_CONS cells, and a "mut many"
  list for mutable arrays, TSOs etc.  Objects on the "mut once" list
  will be eagerly promoted.

- Add finalise#
- Add mkWeakNoFinaliser
- Move deRefWeak# from an out-of-line primop to an inline one.

Finally!  This commits the ongoing saga of Simon's hygiene sweep

FUNCTIONALITY
~~~~~~~~~~~~~
a) The 'unused variable' warnings from the renamer work.  
b) Better error messages here and there, esp type checker
c) Fixities for Haskell 98 (maybe I'd done that before)
d) Lazy reporting of name clashes for Haskell 98 (ditto)

HYGIENE
~~~~~~~
a) type OccName has its own module.  OccNames are represented
   by a single FastString, not three as in the last round.  This
   string is held in Z-encoded form; a decoding function decodes
   for printing in user error messages.  There's a nice tight
   encoding for (,,,,,,,,,,,,,,,,,,,,,,,,,,,,,)

b) type Module is a proper ADT, in module OccName

c) type RdrName is a proper ADT, in its own module

d) type Name has a new, somwhat tidier, representation

e) much grunting in the renamer to get Provenances right.
   This makes error messages look better (no spurious qualifiers)

- Add Stable Names

- Stable pointers and stable names are now both provided by the
  "Stable" module in ghc/lib/exts.  Documentation is updated, and Foriegn
  still exports the stable pointer operations for backwards compatibility.

Resurrect ticky-ticky profiling.  Not quite polished yet, but it
compiles and produces some reasonable-looking stats.

- BLACKHOLE_BQ is a mutable object, because new threads get added to
  its blocking_queue field.  Hence add a mut_link field and treat it
  as mutable in the garbage collector.

- Change StgBlackHole to StgBlockingQueue while I'm at it.

- Optimise evacuation of black holes: don't copy the padding
  words, just skip over them.

- Several garbage collection fixes.

- Improve sanity checking: now the older generations are fully checked
  at each GC.

- Add new object BLACKHOLE_BQ: now a BLACKHOLE is defined as having an
  empty blocking queue, and the first time a thread blocks on a BLACKHOLE
  it is changed into a BLACKHOLE_BQ.

- Remove UPD_INPLACE1 and replace it with UPD_IND in the two places it
  was used.  UPD_INPLACE1 wouldn't have worked in a generational setting.

Remove 'const' modifier from static closure declarations.  Static
closures are meant to live in R/W data space.

Added a generational garbage collector.

The collector is reliable but fairly untuned as yet.  It works with an
arbitrary number of generations: use +RTS -G<gens> to change the
number of generations used (default 2).

Stats: +RTS -Sstderr is quite useful, but to really see what's going
on compile the RTS with -DDEBUG and use +RTS -D32.

ARR_PTRS removed - it wasn't used anywhere.

Sanity checking improved:
	- free blocks are now spammed when sanity checking is turned on
	- a check for leaking blocks is performed after each GC.

Move 4.01 onto the main trunk.