rev115543 (win7): C-x C-f causes SIGSEGV

[Timur Aydin]

rev115543: On Windows7, emacs -Q crashes with a SIGSEGV when attempting 
to visit a file. I have run emacs in gdb and here is the back trace:

address@hidden /cygdrive/c/emacs/bin
$ gdb emacs.exe
GNU gdb (GDB) 7.5
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-mingw32".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from C:\emacs\bin\emacs.exe...done.
(gdb) r
Starting program: C:\emacs\bin\emacs.exe
[New Thread 6204.0x18a8]
[New Thread 6204.0x2690]
[New Thread 6204.0x128]
[New Thread 6204.0xdfc]

Program received signal SIGSEGV, Segmentation fault.
0x039df60d in __register_frame_info ()
(gdb) bt
#0  0x039df60d in __register_frame_info ()
(gdb) Cannot access memory at address 0x6

#0  0x039df60d in __register_frame_info ()
(gdb) Cannot access memory at address 0x6