Further wordsmith release notes for the static analyzer.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180585 91177308-0d34-0410-b5e6-96231b3b80d8
Add a testcase for a recent regression.

Thanks to Bill Wendling for the original testcase.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180586 91177308-0d34-0410-b5e6-96231b3b80d8