[m-dev.] compute_inst_var_sub: inst_matches_initial failed

[Fergus Henderson]

The compiler failed to bootstrap on hg and taifun last night,
with the following error message when compiling `modes'
and `unique_modes' in the stage2/compiler directory:

	Uncaught exception:
	Software Error: compute_inst_var_sub: inst_matches_initial failed
	Stack dump not available in this grade.

This is most likely a result of David Overton's changes to support
polymorphic insts.  David, could you please investigate this one ASAP,
and either fix it or back out your changes?

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3        |     -- the last words of T. S. Garp.
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