[PATCH v1 4/5] aarch64: Add support for FEAT_SME_B16B16 feature.

[Srinath Parvathaneni]

This patch adds support for SME ZA-targeting non-widening BFloat16 instructions,
under tick FEAT_SME_B16B16 and command line flag "+sme-b16b16".

FEAT_SME_B16B16 implements FEAT_SME2 and FEAT_SVE_B16B16, in accordance with that
"+sme-b16b16" enables "+sme2" and "+sve-b16b16".

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/NEWS                                      |   2 +
 gas/config/tc-aarch64.c                       |   2 +
 gas/doc/c-aarch64.texi                        |   8 +-
 .../gas/aarch64/bfloat16-2-invalid.l          |  16 +-
 .../gas/aarch64/bfloat16-sme2-1-bad.d         |   4 +
 .../gas/aarch64/bfloat16-sme2-1-bad.l         | 193 ++++++++++++++++++
 .../gas/aarch64/bfloat16-sme2-1-bad.s         | 173 ++++++++++++++++
 gas/testsuite/gas/aarch64/bfloat16-sme2-1.d   | 122 +++++++++++
 gas/testsuite/gas/aarch64/bfloat16-sme2-1.s   | 139 +++++++++++++
 include/opcode/aarch64.h                      |   2 +
 opcodes/aarch64-tbl.h                         |  26 +++
 11 files changed, 677 insertions(+), 10 deletions(-)
 create mode 100644 gas/testsuite/gas/aarch64/bfloat16-sme2-1-bad.d
 create mode 100644 gas/testsuite/gas/aarch64/bfloat16-sme2-1-bad.l
 create mode 100644 gas/testsuite/gas/aarch64/bfloat16-sme2-1-bad.s
 create mode 100644 gas/testsuite/gas/aarch64/bfloat16-sme2-1.d
 create mode 100644 gas/testsuite/gas/aarch64/bfloat16-sme2-1.s

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