Fix InteriorUseWalker to handle dependent lifetimes as inner scopes

Inner scopes must all be reported because the walker assumes they are
complete. It is up to the client to either complete them or recursively follow
them.

Author: atrick

SwiftCompilerSources/Sources/Optimizer/Utilities/OwnershipLiveness.swift

@@ -785,6 +785,10 @@ extension InteriorUseWalker {
     }
     switch value.ownership {
     case .owned:
+      // Each owned lifetime is an inner scope.
+      if handleInner(borrowed: value) == .abortWalk {
+        return .abortWalk
+      }
       return visitInnerScopeUses(of: value)
     case .guaranteed:
       return visitAllUses(of: value)
@@ -929,6 +933,11 @@ let interiorLivenessTest = FunctionTest("interior_liveness_swift") {
   }
   defer { visitor.deinitialize() }
 
+  visitor.innerScopeHandler = {
+    print("Inner scope: \($0)")
+    return .continueWalk
+  }
+
   let success = visitor.visitUses()
 
   switch visitor.pointerStatus {