[patch] Add libstdc++ type printers for class templates

[Tom Tromey]

>>>>> "Jonathan" == Jonathan Wakely <jwakely@redhat.com> writes:

Jonathan> I forgot to say that with these type recognizers we might want to
Jonathan> revisit the output of the existing printers for the containers, so
Jonathan> that instead of:
Jonathan>  std::map with 3 elements = { ... }
Jonathan> GDB could print the map type:
Jonathan>  std::map<int, int> with 3 elements = { ... }

I think the reason for the brevity right now is just that, even eliding
the defaults, the type names can get rather long.  It's not absurd
though, just maybe not always desirable.  One possible approach would be
to make a new gdb.Parameter in the libstdc++ code to control it.

Tom