(queue_and_load_dwo_tu): New function.
(lookup_dwo_signatured_type): Set per_cu.tu_read.
(maybe_queue_comp_unit): Rename this_cu argument to dependent_cu.
Make dependent_cu optional.
(dw2_do_instantiate_symtab): If we just loaded a CU from a DWO,
and an older .gdb_index is in use, queue and load all its TUs too.
testsuite/
* gdb.base/enumval.c (ZERO): New enum value.
(main): Use it
* gdb.base/enumval.exp: Test ability to print ZERO.
Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
