Hi,

This patch adds missing contraints to FEAT_B16B16 sve2 instructions
bfclamp, bfmla and bfmls and add negative tests for all the bfloat
instructions.

Regression tested for aarch64-none-elf target and found no regressions.

Ok for binutils-master?

Regards,
Srinath.
---
 gas/testsuite/gas/aarch64/bfloat16-1.d        |   6 +
 gas/testsuite/gas/aarch64/bfloat16-1.s        |   7 +-
 .../gas/aarch64/bfloat16-2-invalid.d          |   4 +
 .../gas/aarch64/bfloat16-2-invalid.l          | 265 ++++++++++++++++++
 .../gas/aarch64/bfloat16-2-invalid.s          | 147 ++++++++++
 gas/testsuite/gas/aarch64/bfloat16-bad.l      |   3 +
 gas/testsuite/gas/aarch64/bfloat16-invalid.d  |   2 +-
 gas/testsuite/gas/aarch64/bfloat16-invalid.l  |  17 +-
 gas/testsuite/gas/aarch64/bfloat16-invalid.s  |   9 +-
 opcodes/aarch64-tbl.h                         |  46 +--
 10 files changed, 468 insertions(+), 38 deletions(-)
 create mode 100644 gas/testsuite/gas/aarch64/bfloat16-2-invalid.d
 create mode 100644 gas/testsuite/gas/aarch64/bfloat16-2-invalid.l
 create mode 100644 gas/testsuite/gas/aarch64/bfloat16-2-invalid.s