x86: flag bad EVEX masking for miscellaneous insns

x86: flag bad EVEX masking for miscellaneous insns

Masking is not permitted for certain further insns, not falling in any
of the earlier categories. Introduce the Y macro (not expanding to any
output) to flag such cases.

Note that in a few cases entries already covered otherwise are converted
as well, to continue to allow sharing of the string literals.