PR tree-optimization/29637

	* tree.c (make_vector_type): Don't recurse if TYPE_MAIN_VARIANT
	of the innertype is the innertype itself.

	* gcc.dg/pr29637.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@118175 138bc75d-0d04-0410-961f-82ee72b054a4