When we have profile data we can have cross module references in our ZapSig's when...

When we have profile data we can have cross module references in our ZapSig's when building ReadyToRun images.
We should return a null TypeHandle to indicate failure so that we don't attempt to add generic types/methods
that have cross module references.  (i.e. MyList<System.Guid> )

Commit migrated from https://github.com/dotnet/coreclr/commit/e13760cf8f64a4070ecbe4390a9d3b3170fe5de8