PR c++/17324
	* mangle.c (partially_mangled_name): New variable.
	(partially_mangled_name_len): Likewise.
	(save_partially_mangled_name): New function.
	(restore_partially_mangled_name): Likewise.
	(write_encoding): Save and restore partially mangled names around
	calls to get_mostly_instantiated_function_type.
	(write_unqualified_name): Likewise.

	PR c++/17324
	* g++.dg/template/mangle1.C: New test.

From-SVN: r87530