PR debug/80234
	* dwarf2out.c (gen_member_die): Handle C++17 inline static data
	members with redundant out-of-class redeclaration.

	* g++.dg/debug/dwarf2/pr80234-1.C: New test.
	* g++.dg/debug/dwarf2/pr80234-2.C: New test.

From-SVN: r246743