[PATCH] Reduce gfc_match_strings usage

[Jerry DeLisle]

Roger Sayle wrote:
> The following patch is a resubmission of my 10th March patch to reduce the
> usage of (the inefficient) gfc_match_strings in the gfortran front-end.
> http://gcc.gnu.org/ml/fortran/2007-03/msg00226.html
> 
> Although this patch was approved back then by Jerry DeLisle in
> http://gcc.gnu.org/ml/fortran/2007-03/msg00229.html and it was supported
> in principle by FX (who reconfirmed that gfc_match_strings is the
> "hottest" CPU hog in the gfortran front-end), it's been a while, so I
> thought I'd get it reapproved rather than commit it out of the blue.
> 
> The following patch has been retested again current mainline on
> x86_64-unknown-linux-gnu, with a full "make bootstrap", including
> gfortran, and top-level "make -k check" with no new failures.
> 
> Ok for mainline?
> 
> 
Still OK. :)

Jerry