cleanup: Change condition order

cleanup: Change condition order

Hi, Richard and Richi.

I have double check the recent codes for len && mask support again.

Some places code structure:

if (len_mask_fn)
...
else if (mask_fn)
...

some places code structure:

if (mask_len_fn)
...
else if (mask)

Base on previous review comment from Richi:
https://gcc.gnu.org/pipermail/gcc-patches/2023-July/625067.html

len mask stuff should be checked before mask.

So I reorder all condition order to check LEN MASK stuff before MASK.

This is the last clean up patch.

Boostrap and Regression is on the way.

gcc/ChangeLog:

	* tree-vect-stmts.cc (check_load_store_for_partial_vectors): Change condition order.
	(vectorizable_operation): Ditto.