[patch, fortran] Reduce stack use in blocked matmul

[Jerry DeLisle]

On 05/05/2017 01:31 PM, Thomas Koenig wrote:
> Hello world,
> 
> the attached patch reduces the stack usage by the blocked
> version of matmul for cases where we don't need the full buffer.
> This should improve stack usage.
> 
> Regression-tested.  I also added a stress test (around 3 secs of
> CPU time on my system), it will only run once due to the "dg-do  run"
> hack).
> 
> OK for trunk?
> 

OK, thanks.

Jerry