[Bug fortran/67614] ICE on using arithmetic if with null

[gerhard.steinmetz.fortran@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67614

--- Comment #1 from Gerhard Steinmetz <gerhard.steinmetz.fortran@t-online.de> ---
$ cat z4.f90
program p
   integer, pointer :: z => null()
   if ( z ) 1, 2, 3
 1 stop 1
 2 stop 2
 3 stop 3
end


$ gfortran -g -O0 -Wall -fcheck=all -fno-frontend-optimize z4.f90
$ a.out
Program received signal SIGSEGV: Segmentation fault - invalid memory reference.