* ggc-zone.c (lookup_page_table_if_allocated,
	set_page_table_entry, zone_find_object_size, alloc_small_page,
	alloc_large_page, ggc_free, gt_ggc_m_S, ggc_marked_p, init_ggc,
	new_ggc_zone, init_ggc_pch, ggc_pch_this_base, ggc_pch_read): Fix
	-Wc++-compat and/or -Wcast-qual warnings.

From-SVN: r137450