Python: fetch value when building gdb.Value object

[Tom Tromey]

>>>>> "Paul" == Paul Koning <paulkoning@comcast.net> writes:

Paul> At this point the change has been approved and committed (that
Paul> happened before your comments arrived).  So I guess we have a question
Paul> of whether to change it back.

Yes, I think so.  I think the current approach is going to bite us
later.  We already have bugs open about bad memory management using
gdb.Value.

Tom