Move test from llvm/test/FrontendCXX and update.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137682 91177308-0d34-0410-b5e6-96231b3b80d8

test/SemaCXX/2008-01-11-BadWarning.cpp

+// RUN: %clang_cc1 -fsyntax-only -verify -Wall %s
+// rdar://5683899
+void** f(void **Buckets, unsigned NumBuckets) {
+  return Buckets + NumBuckets;
+}