bug#12426: 24.2.50; Emacs is closed unexpectedly after query-replace

[Eli Zaretskii]

> Date: Wed, 12 Sep 2012 20:06:03 +0200
> From: Dani Moncayo <dmoncayo@gmail.com>
> 
> Recipe from emacs -Q:  a <SPC> b M-a M-% a <SPC> b <RET> c <RET> <SPC>
> 
> After doing that, my Emacs session suddenly ends.

It exits due to an assertion violation.  Looks like the recent changes
that introduced fatal_error_backtrace are a misfeature on Windows.

I'm looking at the reason for the assertion violation; the
fatal_error_backtrace thingy is next.