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
