* c-common.c (fname_as_string): Use lang_hooks.decl_printable_name
with verbosity 0, instead of DECL_NAME, for human-readable string.
* g++.dg/ext/fnname1.C: New test. (__func__ for C++.)
* g++.dg/ext/fnname2.C: Likewise.
* g++.dg/ext/fnname3.C: Likewise.
From-SVN: r71088
