[analyzer] Remove dead code. (This code is trying to implement the idea that PathDiagnosticClient could implement DiagnosticClient and has been dead for a while).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140198 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed