[Bug fortran/125747] ICE in gfc_add_modify_loc, at fortran/trans.cc:229 since r16-5177

[jvdelisle at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125747

--- Comment #2 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Created attachment 64714
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=64714&action=edit
Preliminary patch

This patch fixes the ICE and explains a bit about the problem. It does not
address the question on whether to error on the REAL value as an index value.