Testcase for PR157

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10237 91177308-0d34-0410-b5e6-96231b3b80d8

test/CFrontend/2003-11-26-PointerShift.c

@@ -0,0 +1,4 @@
+unsigned long do_csum(const unsigned char *buff, int len, unsigned long result) {
+  if (2 & (unsigned long) buff) result += 1;
+  return result;
+}