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i#2626 Finish AArch64 encoder/decoder: BF16 instructions

Merged Cam Mannett requested to merge i2626-v8.6-bf16 into master

This patch adds the appropriate macros, tests and codec entries to encode the following variants:

BFCVT   <Hd>, <Sn>
BFCVTN  <Vd>.4H, <Vn>.4S
BFCVTN2 <Vd>.8H, <Vn>.4S
BFDOT   <Vd>.<Ts>, <Vn>.<Tb>, <Vm>.<Tb>
BFDOT   <Vd>.<Ts>, <Vn>.<Tb>, <Vm>.2H[<index>]
BFMLALB <Vd>.4S, <Vn>.8H, <Vm>.8H
BFMLALB <Vd>.4S, <Vn>.8H, <Vm>.H[<index>]
BFMLALT <Vd>.4S, <Vn>.8H, <Vm>.8H
BFMLALT <Vd>.4S, <Vn>.8H, <Vm>.H[<index>]
BFMMLA  <Vd>.4S, <Vn>.8H, <Vm>.8H

Issue #2626