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i#3044 AArch64 SVE codec: Add LDFF1* (scalar plus scalar) instructions

Merged Cam Mannett requested to merge i3044-ldff1 into master

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