Make StmtDumper::VisitCXXFunctionalCastExpr dump the attached cast kind. Fix...

Make StmtDumper::VisitCXXFunctionalCastExpr dump the attached cast kind.  Fix the cast kind for a cast from floating-point to enum type.  (The difference isn't actually visible, but that's just because IRGen is overly forgiving.)  Per report by Enea Zaffanella on cfe-dev.

llvm-svn: 139011