aarch64: Add a aarch64_cpu_supports_inst_p helper

Quite a lot of SME2 instructions have an opcode bit that selects
between 32-bit and 64-bit forms of an instruction, with the 32-bit
forms being part of base SME2 and with the 64-bit forms being part
of an optional extension.  It's nevertheless useful to have a single
opcode entry for both forms since (a) that matches the ISA definition
and (b) it tends to improve error reporting.

This patch therefore adds a libopcodes function called
aarch64_cpu_supports_inst_p that tests whether the target
supports a particular instruction.  In future it will depend
on internal libopcodes routines.

include/opcode/aarch64.h

@@ -1471,6 +1471,9 @@ aarch64_get_operand_desc (enum aarch64_opnd);
 extern bool
 aarch64_sve_dupm_mov_immediate_p (uint64_t, int);
 
+extern bool
+aarch64_cpu_supports_inst_p (uint64_t, aarch64_inst *);
+
 #ifdef DEBUG_AARCH64
 extern int debug_dump;