Fix const/volatile qualifiers of C++ types, PR c++/12328.
* c-typeprint.c (c_type_print_args): Update the function comment. New
variable param_type, initialize it. Remove const/volatile qualifiers
for language_cplus and !show_artificial. Use param_type.
gdb/testsuite/
Fix const/volatile qualifiers of C++ types, PR c++/12328.
* gdb.cp/overload-const.exp: New file.
* gdb.cp/overload-const.cc: New file.
