2018-04-04  Richard Biener  <rguenther@suse.de>

	PR lto/85176
	* dwarf2out.c (dwarf2out_register_external_die): Peel namespaces
	from contexts for DINFO_LEVEL_TERSE and below.

	* g++.dg/lto/pr85176_0.C: New testcase.

From-SVN: r259080