bug#36032: 27.0.50; Massive GC when shift-selecting text in HELLO

[Eli Zaretskii]

> Cc: 36032@debbugs.gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Sat, 1 Jun 2019 16:01:42 +0200
> 
>  > But neither the 17 first GCs nor the 18th one cause any tangible
>  > delays in response to C-f.
> 
> Interesting.  Here the release branch is just as slow as master.
> Visiting HELLO takes about 50 seconds and one shifted C-f about one
> second (or one GC cycle) regardless of where in the buffer I am.
> Moreover, -O0 and -O3 builds incur about the same delays.

OK, I installed the fix on the release branch.  Thanks.