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

[Tobias Burnus]

On Wed, Nov 26, 2014 at 04:55:40PM +0100, Tobias Burnus 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.

Repeating the test on a massively multicore system, it fails at stage2 with an
in-tree 0.14 because -lisl cannot be found at gcc/configure time. Hence,
HAVE_ISL_SCHED_CONSTRAINTS_COMPUTE_SCHEDULE is false and one gets later an
error because a 0.12.2 function is not available with ISL 0.14.

However, running the configure test case manually - or building with fewer
cores - works. As does removing "gcc" after the failure such that isl/ is
available.  Thus, it looks like a dependency problem.

It seems to be fixed by the attached patch.
OK for the trunk?

Tobias
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