cleanup: make all cond_len_* and mask_len_* consistent on the order of mask and len

This patch is depending on:
https://gcc.gnu.org/pipermail/gcc-patches/2023-July/625121.html

Hi, Richard and Richi.

This patch is to align the order of mask and len.

Currently, According to this piece code:
			if (final_len && final_mask)
			  call = gimple_build_call_internal (
			    IFN_LEN_MASK_GATHER_LOAD, 7, dataref_ptr,
			    vec_offset, scale, zero, final_mask, final_len,
			    bias);

You can see the order of mask and len, is {mask,len,bias}.
"mask" comes before "len". The reason of this order is that we want to
reuse the current codes of MASK_GATHER_LOAD/MASK_SCATTER_STORE.

Same situation for COND_LEN_*, we want to reuse the codes of COND_*.

Reusing codes from the existing MASK_* or COND_* can allow us not to
change the codes too much and make the codes elegant and easy to maintain && read.

To avoid any confusions of auto-vectorization patterns that includes both mask and len,

this patch align the order of mask and len for both Gimple IR and RTL pattern into

{mask, len, bias} to make everything cleaner and more elegant.

Bootstrap and Regression is on the way.

gcc/ChangeLog:

	* config/riscv/autovec.md: Align order of mask and len.
	* config/riscv/riscv-v.cc (expand_load_store): Ditto.
	(expand_gather_scatter): Ditto.
	* doc/md.texi: Ditto.
	* internal-fn.cc (add_len_and_mask_args): Ditto.
	(add_mask_and_len_args): Ditto.
	(expand_partial_load_optab_fn): Ditto.
	(expand_partial_store_optab_fn): Ditto.
	(expand_scatter_store_optab_fn): Ditto.
	(expand_gather_load_optab_fn): Ditto.
	(internal_fn_len_index): Ditto.
	(internal_fn_mask_index): Ditto.
	(internal_len_load_store_bias): Ditto.
	* tree-vect-stmts.cc (vectorizable_store): Ditto.
	(vectorizable_load): Ditto.

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