[Bug fortran/66158] Use DO loop constraints for optimizing bounds checking

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66158

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2015-09-06
     Ever confirmed|0                           |1

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Bounds checking is rather cheap. Does the proposed optimization worth the work?