[PATCH] concepts cleanups and subsumption caching

[Andrew Sutton]

This patch finishes moving concepts-related functionality out of pt.c
and into constraint.cc an logic.cc, and adds logic.cc to gtfiles.

As part of that cleanup, I reimplemented and reenabled the subsumption
caching. It's not clear if this provides any significant performance
benefits, but it will prevent redundant and potentially costly
comparisons of constraints.

Tested on bootstrap and vs. cmcstl2.

Andrew Sutton
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