Let's make it available in experimental mode only.

Change-Id: I023db5b98518296eb2964abe8c62f60d65d413a8
We have these _xlfn. and _xlfnodf. internal prefixes. Check for __.

We don't want a name starting with a single underscore to be flagged
as function name.  Let's do that only for double underscores.

Change-Id: If194a53e3f3ebf18a6e8ad38ebb16922f6e6083b
don't create and destroy SvtMiscOptions here unless its needed.

Change-Id: I4b6e8136c56c824380c454272d9df4c646ec8e86