RISC-V: Implement ZKND and ZKNE extensions

RISC-V: Implement ZKND and ZKNE extensions

This patch supports Zkne and Zknd extension.
It includes instruction's machine description and built-in funtions.

gcc/ChangeLog:

	* config/riscv/constraints.md (D03): Add constants of bs and rnum.
	(DsA): New.
	* config/riscv/crypto.md (riscv_aes32dsi): Add ZKND's and ZKNE's instructions.
	(riscv_aes32dsmi): New.
	(riscv_aes64ds): New.
	(riscv_aes64dsm): New.
	(riscv_aes64im): New.
	(riscv_aes64ks1i): New.
	(riscv_aes64ks2): New.
	(riscv_aes32esi): New.
	(riscv_aes32esmi): New.
	(riscv_aes64es): New.
	(riscv_aes64esm): New.
	* config/riscv/riscv-builtins.cc (AVAIL): Add ZKND's and ZKNE's AVAIL.
	* config/riscv/riscv-scalar-crypto.def (DIRECT_BUILTIN): Add ZKND's and
	ZKNE's built-in functions.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/zknd32.c: New test.
	* gcc.target/riscv/zknd64.c: New test.
	* gcc.target/riscv/zkne32.c: New test.
	* gcc.target/riscv/zkne64.c: New test.

Co-Authored-By: SiYu Wu <siyu@isrc.iscas.ac.cn>