[m-rev.] for review: abstract insts and modes for .int3 files

[Zoltan Somogyi]

For review by anyone. The main thing I am seeking feedback on
right now is the syntax. In the longer term, we may want to make
abstract insts and modes a user visible part of the language, for which
the syntax in this diff is NOT suitable; does anyone have a syntax
that IS suitable? And would user visible abstract insts and modes
be desirable anyway?

The diff is with -b.

Zoltan.
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