[PATCH] Fix build with ISL 0.20

[Richard Biener]

The following fixes build with ISL 0.20, tested by building with
ISL 0.20 and 0.15 (the oldest supported ISL).

Applied to trunk, will commit to the branches as well.

Richard.

2018-08-01  Richard Biener  <rguent...@suse.de>

        PR bootstrap/86724
        * graphite.h: Include isl/id.h and isl/space.h to allow build
        with ISL 0.20.

Index: gcc/graphite.h
===================================================================
--- gcc/graphite.h      (revision 263190)
+++ gcc/graphite.h      (working copy)
@@ -37,6 +37,8 @@ along with GCC; see the file COPYING3.
 #include <isl/schedule.h>
 #include <isl/ast_build.h>
 #include <isl/schedule_node.h>
+#include <isl/id.h>
+#include <isl/space.h>
 
 typedef struct poly_dr *poly_dr_p;