libpmc: remove PMC_MDEP_TABLE logic

[mhorne]

Summary

This logic was added for handling some of the complicated relationships
between events and x86 CPU models. Since that logic has been mostly
removed from libpmc(3) in favor of pmu-events, this no longer serves
much of a purpose. Mapping CPU types to event tables is already handled
by the switch statement in pmc_init().

[emaste]

So in effect this basically just repeated existing tests that exist elsewhere?

[mhorne]

In D30196#678069, @emaste wrote:

So in effect this basically just repeated existing tests that exist elsewhere?

Pretty much. pmc_init() adds only supported classes to the pmc_class_table array, so pmc_mdep_is_supported_class() only duplicates work by checking those classes against its own tables.

[ray]

I like it.
Thanks!