bug#38748: 28.0.50; crash on MacOS 10.15.2

[Robert Pluim]

>>>>> On Fri, 10 Jan 2020 11:21:59 +0200, Eli Zaretskii <eliz@gnu.org> said:

    >> From: Robert Pluim <rpluim@gmail.com>
    >> Cc: Pip Cet <pipcet@gmail.com>,  38748@debbugs.gnu.org,  alan@idiocy.org,
    >> andreyk.mad@gmail.com,  jguenther@gmail.com
    >> Date: Fri, 10 Jan 2020 09:58:52 +0100
    >> 
    >> Itʼs possible that there is only one bug.

    Eli> I certainly hope so!

    >> The emacs Iʼve been using with the change in nsterm.m suggested by
    >> Pip has been completely stable. If it does crash again I can trawl
    >> through last_marked.

Although of course that build is with '-O0', and if there is a 2nd bug
it would be optimization dependent. Iʼll rebuild with the default
'-O2' and run that.

Robert