[PATCH 0/6] x86: drop L1OM/K1OM from gas plus associated tidying

[Jan Beulich]

It was the bugs / shortcomings dealt with here as a "side effect"
which made me raise the question of the utility of having the
rudimentary support for the two sub-architectures. Oddly enough
some of the bugs need fixing _before_ removing the support, or else
IAMCU would regress. Furthermore a new IAMCU test can be put in
place only _after_ removing the support.

1: assorted IAMCU CPU checking fixes
2: drop L1OM/K1OM support from gas
3: add another IAMCU testcase
4: unify CPU flag on/off processing
5: never set i386_cpu_flags' "unused" field
6: don't accept base architectures as extensions

Jan