mingw32 tweaks.

Back out accidental commits.

Fix small stats bug in the -G1 case.

Fix run queue corruption bug.

Copyright police.

Be more MBLOCK-friendly when allocating and resizing stacks.  This
should reduce the memory footprint a bit.

- 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 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.

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.

- check for silly stack sizes in the right place
- stub the link field of the running TSO (fixes a bug in the
  _ccall_GC support).

Move 4.01 onto the main trunk.