[m-rev.] for review: add support for MPS GC

[Fergus Henderson]

This is still fairly preliminary, and my initial performance
results are not very encouraging.  However, I think this is
now at a point where it is worth posting for review.

Estimated hours taken: 60
Branches: main

Add support for interfacing Mercury with the MPS garbage collector.

This change is broken into three parts:

	1. Import version 1.100.1 of the MPS kit into the Mercury
	   CVS repository, in the directory `mercury/mps_gc'.

	2. Make some changes to the MPS kit for Mercury,
	   to support fully-conservative collection and tagged pointers,
	   and to wrap it in an interface that is similar to that of
	   the Boehm collector.

	3. Modify the rest of the Mercury implementation
	   to support linking with the MPS kit instead
	   of the Boehm collector.  This involved defining
	   `mps' as a new GC method and a new grade component.

[parts to follow, separately]

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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