Rewrite signal handlers to include the parameters
in the rewrite. Also check whether parameters are
actually used when possible, and if not don't
provide them to the expression.

Change-Id: I7d65c05f4639979dd61035cf7478119ef7647c25
Reviewed-by: Matthew Vogt <matthew.vogt@nokia.com>
Reviewed-by: Kent Hansen <kent.hansen@nokia.com>