Add a testcase for PR 84799

This was introduced by r258390 and fixed by r258415.

	* gcc.dg/pr84799.c: New test.

From-SVN: r258448

gcc/testsuite/ChangeLog

+2018-03-12  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* gcc.dg/pr84799.c: New test.
+
 2018-03-12  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/84803

gcc/testsuite/gcc.dg/pr84799.c

+/* { dg-do compile } */
+/* { dg-options "-O" } */
+
+int a, g;
+long b, f;
+short c, d, e;
+
+static void fn1 ()
+{
+  if (a)
+    {
+      long i = 5, j = b / i | c;
+      int k = b % (d % i) & j;
+      short l = ~f % (-d / j ^ -e), m = e << (d - l);
+      if (k)
+        m = d;
+      i = d | (i & b);
+      g = (c | ~f) % i + l;
+      e = (c - f) & e;
+      d = m;
+    }
+}
+
+int main ()
+{
+  b |= 1;
+  fn1 ();
+  return 0; 
+}