Commit forgotten testecase for pr71727.

From-SVN: r253251

gcc/testsuite/gcc.target/aarch64/pr71727-2.c

+/* { dg-do compile } */
+/* { dg-options "-mstrict-align -O3" } */
+
+unsigned char foo(const unsigned char *buffer, unsigned int length)
+{
+  unsigned char sum;
+  unsigned int  count;
+
+  for (sum = 0, count = 0; count < length; count++) {
+    sum = (unsigned char) (sum + *(buffer + count));
+  }
+
+  return sum;
+}
+
+/* { dg-final { scan-assembler-times "and\tw\[0-9\]+, w\[0-9\]+, 15" 1 } } */