Vect: correct rebase issue

Vect: correct rebase issue

The lines being removed have been updated and merged into a new
condition.  But when resolving some conflicts I accidentally
reintroduced them causing some test failes.

This removes them.

Committed as the changes were previously approved in
https://gcc.gnu.org/pipermail/gcc-patches/2021-July/574977.html
but the hunk was misapplied during a rebase.

gcc/ChangeLog:

	* tree-vect-patterns.c (vect_recog_dot_prod_pattern):
	Remove erroneous line.

gcc/testsuite/ChangeLog:

	* gcc.dg/vect/vect-reduc-dot-11.c: Expect pass.
	* gcc.dg/vect/vect-reduc-dot-15.c: Likewise.
	* gcc.dg/vect/vect-reduc-dot-19.c: Likewise.
	* gcc.dg/vect/vect-reduc-dot-21.c: Likewise.