RISC-V: Add configuration-setting instructions for T-Head VECTOR vendor extension

T-Head has a range of vendor-specific instructions.
Therefore it makes sense to group them into smaller chunks
in form of vendor extensions.

This patch adds configuration-setting instructions for the "XTheadVector"
extension. The 'th' prefix and the "XTheadVector" extension are documented
in a PR for the RISC-V toolchain conventions ([1]).

[1] https://github.com/riscv-non-isa/riscv-toolchain-conventions/pull/19

Co-developed-by: Lifang Xia <lifang_xia@linux.alibaba.com>
Co-developed-by: Christoph Müllner <christoph.muellner@vrull.eu>

gas/ChangeLog:

	* testsuite/gas/riscv/x-thead-vector.d: New test.
	* testsuite/gas/riscv/x-thead-vector.s: New test.

opcodes/ChangeLog:

	* riscv-opc.c: Likewise..

0 files changed, 0 insertions, 0 deletions