RFC: fix PR c++/14999

[Tom Tromey]

Joel> Unfortunately, this patch causes a number of regressions which do
Joel> appear with the testsuite if you run it with gdbserver.

Oops, sorry, Joel.  I should have dug deeper.

Joel> I don't really understand the code well enough to be sure about
Joel> my fix, in particular what the "loc" parameter is about, but
Joel> the attached patch seems to restore the origin behavior while
Joel> still keeping your new testcase happy.

Feel free to kick regressions back to me.

Tom