[PATCH v4 2/5] aarch64: Add support for FEAT_SVE_B16B16 min and max instructions.

[Srinath Parvathaneni]

This patch adds support for SME Z-targeting multi-vector non-widening
BFloat16 instructions, under tick FEAT_SVE_B16B16 and command line flag
"+sve-b16b16+sme2".

Also the test files related to FEAT_SVE_B16B16 (+sme2) are prefixed with
sve-b16b16-sme2*.
eg: sve-b16b16-sme2-1.s, sve-b16b16-sme2-1.d.

The spec for this feature and instructions is availabe here [1]:
[1]: https://developer.arm.com/documentation/ddi0602/2024-06/SME-Instructions?lang=en
---
 .../gas/aarch64/sve-b16b16-sme2-bad-1.d       |   3 +
 .../gas/aarch64/sve-b16b16-sme2-bad-1.l       | 159 ++++++++++++++++++
 .../gas/aarch64/sve-b16b16-sme2-bad-1.s       | 136 +++++++++++++++
 gas/testsuite/gas/aarch64/sve-b16b16-sme2.d   | 122 ++++++++++++++
 gas/testsuite/gas/aarch64/sve-b16b16-sme2.s   | 138 +++++++++++++++
 .../gas/aarch64/sve-b16b16-sve2-bad-2.l       |   4 +-
 opcodes/aarch64-tbl.h                         |  29 ++++
 7 files changed, 589 insertions(+), 2 deletions(-)
 create mode 100644 gas/testsuite/gas/aarch64/sve-b16b16-sme2-bad-1.d
 create mode 100644 gas/testsuite/gas/aarch64/sve-b16b16-sme2-bad-1.l
 create mode 100644 gas/testsuite/gas/aarch64/sve-b16b16-sme2-bad-1.s
 create mode 100644 gas/testsuite/gas/aarch64/sve-b16b16-sme2.d
 create mode 100644 gas/testsuite/gas/aarch64/sve-b16b16-sme2.s

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