[Build, Graphite] PR64017 - support ISL-0.14 (gcc/configure.ac and gcc/graphite*.c)

[Jack Howarth]

   This patch bootstraps fine on x86_64-apple-darwin14 against isl
0.14 at r218098.
              Jack

On Wed, Nov 26, 2014 at 10:55 AM, Tobias Burnus
<tobias.burnus@physik.fu-berlin.de> wrote:
> This patch adds a configure check for isl_schedule_constraints_compute_schedule,
> which is new in ISL 0.13 - and uses it for conditional compilation.
>
> The graphite*c patch is based on the one of Jack Howarth,
> https://gcc.gnu.org/ml/gcc-patches/2014-11/msg00906.html - without checking
> whether the ISL replacements make sense.
>
> With the patch, I have successfully bootstrapped GCC with ISL 0.12.2 and
> ISL 0.14 (both using an in-tree build).  [I still have to regtest the two
> variants and I also want to do a system-ISL built with ISL 0.12.2]
>
> Is the patch OK for the trunk?
>
> Tobias
>
> PS: I'd be happy if some others could run additional tests.
>
> PPS: If the patch is in, can someone put ISL 0.14 to infrastructure? Then
> one can update contrib/download_prerequisites - such that the graphite
> failure is at least fixed for in-tree builds (cf. PR64017, PR62289).