Since mask of vec_merge is in HOST_WIDE_INT, HOST_BITS_PER_WIDE_INT is
the maximum number of vector elements.

	* simplify-rtx.c (simplify_subreg): Limit mask of vec_merge to
	HOST_BITS_PER_WIDE_INT.
	(test_vector_ops_duplicate): Likewise.

From-SVN: r265290