Attempting to build clang with CLANG_ENABLE_STATIC_ANALYZER=OFF fails
after rC362328, because the new plugins under lib/Analysis/plugins are
dependent on the static analyzer libraries.
Add checks to disable building these if CLANG_ENABLE_STATIC_ANALYZER is
OFF.
Is this file a thing? lib/Analysis/plugins/CMakeLists.txt? I can't seem to find it anywhere.