Check if newly generated component functions happen to override something
which they're not supposed to.
Create new slice to store mapping from annotation descriptors to
corresponding PSI elements, which is used by override checker to report
errors in data classes on.
Reuse existing (but not used) VALUE_PARAMETER_AS_PROPERTY in
BindingContext to store mapping from constructor's value parameters to
property descriptors.
Create a new slice DATA_CLASS_COMPONENT_FUNCTION to store mapping from
constructor's value parameters to generated componentN functions.
Andrey Breslav