PR bootstrap/80486 - spurious -Walloc-size-larger-than and -Wstringop-overflow in dominance.c during profiledbootstrap

gcc/ChangeLog:

	PR bootstrap/80486
	* dominance.c (dom_info::m_n_basic_blocks): Change type to unsigned.
	(new_zero_array): Adjust signature.
	(dom_info::dom_init): Used unsigned rather that size_t.
	(dom_info::dom_info): Same.

From-SVN: r247261