This patch adds the appropriate macros, tests and codec entries to encode the following variants:
LDFF1B { <Zt>.H }, <Pg>/Z, [<Xn|SP>{, <Xm>}]
LDFF1B { <Zt>.S }, <Pg>/Z, [<Xn|SP>{, <Xm>}]
LDFF1B { <Zt>.D }, <Pg>/Z, [<Xn|SP>{, <Xm>}]
LDFF1B { <Zt>.B }, <Pg>/Z, [<Xn|SP>{, <Xm>}]
LDFF1D { <Zt>.D }, <Pg>/Z, [<Xn|SP>{, <Xm>, LSL #3}]
LDFF1H { <Zt>.H }, <Pg>/Z, [<Xn|SP>{, <Xm>, LSL #1}]
LDFF1H { <Zt>.S }, <Pg>/Z, [<Xn|SP>{, <Xm>, LSL #1}]
LDFF1H { <Zt>.D }, <Pg>/Z, [<Xn|SP>{, <Xm>, LSL #1}]
LDFF1SB { <Zt>.H }, <Pg>/Z, [<Xn|SP>{, <Xm>}]
LDFF1SB { <Zt>.S }, <Pg>/Z, [<Xn|SP>{, <Xm>}]
LDFF1SB { <Zt>.D }, <Pg>/Z, [<Xn|SP>{, <Xm>}]
LDFF1SH { <Zt>.S }, <Pg>/Z, [<Xn|SP>{, <Xm>, LSL #1}]
LDFF1SH { <Zt>.D }, <Pg>/Z, [<Xn|SP>{, <Xm>, LSL #1}]
LDFF1SW { <Zt>.D }, <Pg>/Z, [<Xn|SP>{, <Xm>, LSL #2}]
LDFF1W { <Zt>.S }, <Pg>/Z, [<Xn|SP>{, <Xm>, LSL #2}]
LDFF1W { <Zt>.D }, <Pg>/Z, [<Xn|SP>{, <Xm>, LSL #2}]Issue #3044