opcodes/aarch64: split off creation of comment text in disassembler

The function aarch64_print_operand (aarch64-opc.c) is responsible for
converting an instruction operand into the textual representation of
that operand.

In some cases, a comment is included in the operand representation,
though this (currently) only happens for the last operand of the
instruction.

In a future commit I would like to enable the new libopcodes styling
for AArch64, this will allow objdump and GDB[1] to syntax highlight
the disassembler output, however, having operands and comments
combined in a single string like this makes such styling harder.

In this commit, I propose to extend aarch64_print_operand to take a
second buffer.  Any comments for the instruction are written into this
extra buffer.  The two callers of aarch64_print_operand are then
updated to pass an extra buffer, and print any resulting comment.

In this commit no styling is added, that will come later.  However, I
have adjusted the output slightly.  Before this commit some comments
would be separated from the instruction operands with a tab character,
while in other cases the comment was separated with two single spaces.

After this commit I use a single tab character in all cases.  This
means a few test cases needed updated.  If people would prefer me to
move everyone to use the two spaces, then just let me know.  Or maybe
there was a good reason why we used a mix of styles, I could probably
figure out a way to maintain the old output exactly if that is
critical.

Other than that, there should be no user visible changes after this
commit.

[1] GDB patches have not been merged yet, but have been posted to the
GDB mailing list:
https://sourceware.org/pipermail/gdb-patches/2022-June/190142.html

include/opcode/aarch64.h

@@ -1371,7 +1371,7 @@ aarch64_get_opcode (enum aarch64_op);
 extern void
 aarch64_print_operand (char *, size_t, bfd_vma, const aarch64_opcode *,
 		       const aarch64_opnd_info *, int, int *, bfd_vma *,
-		       char **,
+		       char **, char *, size_t,
 		       aarch64_feature_set features);
 
 /* Miscellaneous interface.  */