Predicate numbers are available in the maps
isa.settings.predicate_number and isa.instp_number instead.
Like the name field, predicate numbers don't interact well with
unique_pred().
The name of a predicate was only ever used for named settings that are
computed as a boolean expression of other settings.
- Record the names of these settings in named_predicates instead.
- Remove the name field from all predicates.
Named predicates does not interact well with the interning of predicates
through isa.unique_pred().
Fixes#11.
Presets are groups of settings and values applied at once. This is used
as a shorthand in test files, so for example "isa intel nehalem" enables
all of the CPUID bits that the Nehalem micro-architecture provides.
