Add nullability annotations to System.Private.Xml.Linq project#40744

Merged

jozkee merged 4 commits intodotnet:masterfrom jozkee:nullability_xpath4

Aug 20, 2020

+809-738

Commits on Aug 13, 2020

Commits on Aug 14, 2020

Address feedback
jozkee
committed

Commits on Aug 18, 2020

Add missing NotNullIfNotNull attributes to operators
jozkee
committed