* dwarf2read.c (struct partial_die_info): New member: has_pc_info.

* dwarf2read.c (struct partial_die_info): New member: has_pc_info.
(read_partial_die): Delete fourth argument; we return this info in
the struct partial_die_info object itself now.
(dwarf2_build_psymtabs_hard, scan_partial_symbols): Use the
has_pc_info field of the partial die struct, rather than passing a
variable by reference to read_partial_die.