This patch adds the appropriate macros, tests and codec entries to encode the following variants:
FEXPA <Zd>.<Ts>, <Zn>.<Ts>
FTMAD <Zdn>.<Ts>, <Zdn>.<Ts>, <Zm>.<Ts>, #<imm>
FTSMUL <Zd>.<Ts>, <Zn>.<Ts>, <Zm>.<Ts>
FTSSEL <Zd>.<Ts>, <Zn>.<Ts>, <Zm>.<Ts>Issue: #3044