Also, it was the only reason that `argc` and `argv` were being passed
into createDiagnostics, so remove those parameters and clean up callers.
llvm-svn: 172945
the various stakeholders bump up the reference count. In particular,
the diagnostics engine now keeps the DiagnosticOptions object alive.
llvm-svn: 166508
show-enabled uses the command line you give it to build a CompilerInstance,
so any flags you pass will be processed as if running clang proper.
llvm-svn: 157842
Sean Silva