bpf: there is no ldinddw nor ldabsdw instructions

bpf: there is no ldinddw nor ldabsdw instructions

There are no legacy ldind nor ldabs BPF instructions with BPF_SIZE_DW.
For some reason we were (incorrectly) supporting these.  This patch
updates the opcodes so the instructions get removed and modifies the
GAS manual and testsuite accordingly.

See discussion at
https://lore.kernel.org/bpf/110aad7a-f8a3-46ed-9fda-2f8ee54dcb89@linux.dev

Tested in bpf-uknonwn-none target, x86-64-linux-gnu host.

include/ChangeLog:

2024-01-29  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* opcode/bpf.h (enum bpf_insn_id): Remove BPF_INSN_LDINDDW and
	BPF_INSN_LDABSDW instructions.

opcodes/ChangeLog:

2024-01-29  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* bpf-opc.c (bpf_opcodes): Remove BPF_INSN_LDINDDW and
	BPF_INSN_LDABSDW instructions.

gas/ChangeLog:

2024-01-29  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* doc/c-bpf.texi (BPF Instructions): There is no indirect 64-bit
	load instruction.
	(BPF Instructions): There is no absolute 64-bit load instruction.
	* testsuite/gas/bpf/mem.s: Update test accordingly.
	* testsuite/gas/bpf/mem-be-pseudoc.d: Likewise.
	* testsuite/gas/bpf/mem-be.d: Likewise.
	* testsuite/gas/bpf/mem-pseudoc.d: Likewise.
	* testsuite/gas/bpf/mem-pseudoc.s: Likewise.
	* testsuite/gas/bpf/mem.d: Likewise.
	* testsuite/gas/bpf/mem.s: Likewise.