[CMake] clangStaticAnalyzerFrontend: Deprecate LLVM_NO_RTTI.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@200296 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] Apply llvm_update_compile_flags() to add_clang_library().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@200302 91177308-0d34-0410-b5e6-96231b3b80d8