Add a testcase for PR tree-optimization/63835

	PR tree-optimization/63835
	* gcc.dg/pr63835.c: New test.

From-SVN: r217441

gcc/testsuite/ChangeLog

+2014-11-12  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR tree-optimization/63835
+	* gcc.dg/pr63835.c: New test.
+
 2014-11-12  Alan Lawrence  <alan.lawrence@arm.com>
 
          * gcc.target/aarch64/simd/vqdmlal_high_lane_s16_indices_1.c: New test.

gcc/testsuite/gcc.dg/pr63835.c

+/* { dg-do compile } */
+/* { dg-options "-Os" } */
+
+int a;
+
+int
+fn1 (int p)
+{
+  return -p;
+}
+
+void
+fn2 ()
+{
+  fn1 (-(unsigned int) a);
+}