[Bug fortran/68147] Potential incorrect code generation for string self-assignment

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68147

--- Comment #14 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> With one thing and another, I completely forgot about the backport.
> Yes, please do. I am not able to do commits fo the next week.

Upon further investigation revision r233797 caused the pr70040 regression. IMO
it would be better to fix the regression before doing the back port to the
gcc-5 branch.