x86 instruction classification

[Jim Keniston]

As promised on yesterday's SystemTap call, here's inat.c.  It consists
of a couple of tables that capture more information about the x86
instruction sets.  For example, you could use this code to determine
whether an opcode/instruction is invalid, privileged, a floating-point
op, or in some other way of possible interest to uprobes and/or kprobes.

Also included is cmp.c, a user program that provides an example of the
tables' use and also serves as a check against the tables currently in
use by x86 ubp/uprobes.  (There are a few differences, which reflect
either corrections in inat.c or differences in how the tables are used.)

The intention is eventually provide this as an enhancement to our x86
instruction-analysis code.

inat.c uses the x86 kvm approach of one bitmap for each opcode.

Comments welcome.
Jim
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