bug#37382: 27.0.50; Emacs crashes after assert condition fails

[Eli Zaretskii]

> From: Tino Calancha <tino.calancha@gmail.com>
> Date: Wed, 11 Sep 2019 19:50:16 +0200
> 
> 
> ;; Emacs crashes in my system with the following recipe:
> emacs -Q:
> M-x profiler-start RET RET

Stefan, please take a look: this looks like the result of your changes
in c74da403a.  On my system, where Emacs is compiled with --enable-checking,
I get an assertion violation:

  fns.c:4338: Emacs fatal error: assertion failed: EQ (Qunbound, (HASH_KEY (h, 
i)))