This patch adds the appropriate macros, tests and codec entries to encode the following variants:
SMMLA <Vd>.4S, <Vn>.16B, <Vm>.16B
SUDOT <Vd>.<Ts>, <Vn>.<Tb>, <Vm>.4B[<index>]
UMMLA <Vd>.4S, <Vn>.16B, <Vm>.16B
USMMLA <Vd>.4S, <Vn>.16B, <Vm>.16B
USDOT <Vd>.<Ts>, <Vn>.<Tb>, <Vm>.<Tb>
USDOT <Vd>.<Ts>, <Vn>.<Tb>, <Vm>.4B[<index>]Issue #2626