re PR tree-optimization/43801 (error: function causes a section type conflict with -fipa-cp -fipa-cp-clone)

	PR tree-optimization/43801
	* cgraph.c (cgraph_create_virtual_clone): Clear DECL_SECTION_NAME
	if old_decl was DECL_ONE_ONLY.

	* g++.dg/torture/pr43801.C: New test.

From-SVN: r161564