Merge remote-tracking branch 'origin/master' into master-next

include/swift/Basic/LangOptions.h

@@ -357,6 +357,10 @@ namespace swift {
     /// conformances.
     bool EnableExperimentalAdditiveArithmeticDerivedConformances = false;
 
+    /// Whether to enable a more aggressive mode of incremental dependency
+    /// gathering that never captures cascading edges.
+    bool EnableExperientalPrivateIntransitiveDependencies = false;
+
     /// Enable verification when every SubstitutionMap is constructed.
     bool VerifyAllSubstitutionMaps = false;