Fixed 'index out of bounds' on ProvidedConstructors containing invokable code.
Added isGenerated check.
Added recent changes from codeplex to address a few recent bugs.

See: added simple equivalence check fotsymbolic types:
https://fsharp3sample.codeplex.com/SourceControl/changeset/24323

Add correct base constructor IL op codes:
https://fsharp3sample.codeplex.com/SourceControl/changeset/24356