Stage in -experimental-private-intransitive-dependencies

Add a flag to support setting the evaluator-based dependency collector in a mode that ignores scope inversions and only collects private dependencies.

Author: CodaFi

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;
 

include/swift/Option/Options.td

@@ -511,6 +511,12 @@ def enable_experimental_concise_pound_file : Flag<["-"],
   Flags<[FrontendOption]>,
   HelpText<"Enable experimental concise '#file' identifier">;
 
+def experimental_private_intransitive_dependencies : Flag<["-"],
+    "experimental-private-intransitive-dependencies">,
+  Flags<[FrontendOption, HelpHidden]>,
+  HelpText<"Enable experimental dependency tracking that never cascades">;
+
+
 // Diagnostic control options
 def suppress_warnings : Flag<["-"], "suppress-warnings">,
   Flags<[FrontendOption]>,