[PR86064] split single cross-partition range with nonzero locviews

We didn't split cross-partition ranges in loclists to output a
whole-function location expression, but with nonzero locviews, we
force loclists, and then we have to split to avoid cross-partition
list entries.

for  gcc/ChangeLog

	PR debug/86064
	* dwarf2out.c (loc_list_has_views): Adjust comments.
	(dw_loc_list): Split single cross-partition range with
	nonzero locview.

for  gcc/testsuite/ChangeLog

	PR debug/86064
	* gcc.dg/pr86064.c: New.

From-SVN: r262130