re PR rtl-optimization/84643 (gcc/optabs.c:6549:26: runtime error: load of value…

re PR rtl-optimization/84643 (gcc/optabs.c:6549:26: runtime error: load of value 131075, which is not a valid value for type 'memmodel')

	PR rtl-optimization/84643
	* memmodel.h (enum memmodel): Add MEMMODEL_MAX enumerator.

From-SVN: r258662

gcc/ChangeLog

+2018-03-19  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/84643
+	* memmodel.h (enum memmodel): Add MEMMODEL_MAX enumerator.
+
 2018-03-19  Maxim Ostapenko  <m.ostapenko@samsung.com>
 
 	PR sanitizer/78651

gcc/memmodel.h

@@ -45,7 +45,9 @@ enum memmodel
   MEMMODEL_LAST = 6,
   MEMMODEL_SYNC_ACQUIRE = MEMMODEL_ACQUIRE | MEMMODEL_SYNC,
   MEMMODEL_SYNC_RELEASE = MEMMODEL_RELEASE | MEMMODEL_SYNC,
-  MEMMODEL_SYNC_SEQ_CST = MEMMODEL_SEQ_CST | MEMMODEL_SYNC
+  MEMMODEL_SYNC_SEQ_CST = MEMMODEL_SEQ_CST | MEMMODEL_SYNC,
+  /* Say that all the higher bits are valid target extensions.  */
+  MEMMODEL_MAX = INTTYPE_MAXIMUM (int)
 };
 
 /* Return the memory model from a host integer.  */