[AArch64][SVE 12/32] Remove boolean parameters from parse_address_main

[AArch64][SVE 12/32] Remove boolean parameters from parse_address_main

In the review of the original version of this series, Richard didn't
like the use of boolean parameters to parse_address_main.  I think we
can just get rid of them and leave the callers to check the addressing
modes.  As it happens, the handling of ADDR_SIMM9{,_2} already did this
for relocation operators (i.e. it used parse_address_reloc and then
rejected relocations).

The callers are already set up to reject invalid register post-indexed
addressing, so we can simply remove the accept_reg_post_index parameter
without adding any more checks.  This again creates a corner case where:

	.equ	x2, 1
	ldr	w0, [x1], x2

was previously an acceptable way of writing "ldr w0, [x1], #1" but
is now rejected.

Removing the "reloc" parameter means that two cases need to check
explicitly for relocation operators.

ADDR_SIMM9_2 appers to be unused.  I'll send a separate patch
to remove it.

This patch makes parse_address temporarily equivalent to
parse_address_main, but later patches in the series will need
to keep the distinction.

gas/
	* config/tc-aarch64.c (parse_address_main): Remove reloc and
	accept_reg_post_index parameters.  Parse relocations and register
	post indexes unconditionally.
	(parse_address): Remove accept_reg_post_index parameter.
	Update call to parse_address_main.
	(parse_address_reloc): Delete.
	(parse_operands): Call parse_address instead of parse_address_main.
	Update existing callers of parse_address and make them check
	inst.reloc.type where appropriate.
	* testsuite/gas/aarch64/diagnostic.s: Add tests for relocations
	in ADDR_SIMPLE, SIMD_ADDR_SIMPLE, ADDR_SIMM7 and ADDR_SIMM9 addresses.
	Also test for invalid uses of post-index register addressing.
	* testsuite/gas/aarch64/diagnostic.l: Update accordingly.