[openacc, testsuite] Fix undefined behaviour in atomic_capture-1.c

2018-04-29  Julian Brown  <julian@codesourcery.com>
	    Tom de Vries  <tom@codesourcery.com>

	PR testsuite/85527
	* testsuite/libgomp.oacc-c-c++-common/atomic_capture-1.c: Allow
	arbitrary order for iterations of atomic subtract check.

Co-Authored-By: Tom de Vries <tom@codesourcery.com>

From-SVN: r259748

libgomp/ChangeLog

+2018-04-29  Julian Brown  <julian@codesourcery.com>
+	    Tom de Vries  <tom@codesourcery.com>
+
+	PR testsuite/85527
+	* testsuite/libgomp.oacc-c-c++-common/atomic_capture-1.c: Allow
+	arbitrary order for iterations of atomic subtract check.
+
 2018-04-28  Tom de Vries  <tom@codesourcery.com>
 
 	PR testsuite/85527

libgomp/testsuite/libgomp.oacc-c-c++-common/atomic_capture-1.c

@@ -795,17 +795,16 @@ main(int argc, char **argv)
       }
   }
 
+  int ones = 0, thirtyones = 0;
+
   for (i = 0; i < N; i++)
-    if (i % 2 == 0)
-      {
-	if (fdata[i] != 31.0)
-	  abort ();
-      }
-    else
-      {
-	if (fdata[i] != 1.0)
+    if (fdata[i] == 31.0)
+      thirtyones++;
+    else if (fdata[i] == 1.0)
+      ones++;
+
+  if (ones != N / 2 || thirtyones != N / 2)
     abort ();
-      }
 
 
   /* BINOP = / */