tree-vrp.h: Add include guard.

2017-08-03  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	* tree-vrp.h: Add include guard.

From-SVN: r250846

gcc/ChangeLog

+2017-08-03  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
+
+	* tree-vrp.h: Add include guard.
+
 2017-08-02  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/81644

gcc/tree-vrp.h

@@ -17,6 +17,9 @@ You should have received a copy of the GNU General Public License
 along with GCC; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */
 
+#ifndef GCC_TREE_VRP_H
+#define GCC_TREE_VRP_H
+
 /* Type of value ranges.  See value_range_d In tree-vrp.c for a
    description of these types.  */
 enum value_range_type { VR_UNDEFINED, VR_RANGE,
@@ -57,3 +60,4 @@ extern void extract_range_from_unary_expr (value_range *vr,
 					   value_range *vr0_,
 					   tree op0_type);
 
+#endif /* GCC_TREE_VRP_H */