[Bug fortran/105691] Incorrect calculation of INDEX(str1,str2) at compile time

[sgk at troutmask dot apl.washington.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105691

--- Comment #6 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Tue, Jun 21, 2022 at 09:28:27PM +0000, anlauf at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105691
> 
> --- Comment #5 from anlauf at gcc dot gnu.org ---
> Submitted version: https://gcc.gnu.org/pipermail/fortran/2022-June/057940.html
> 

Harald, looks like a straight forward translation of the 
library algorithm.  OK to commit.