Merge pull request #4068 from practicalswift/unused-cpp-identifiers-ii

[gardening] Remove unused method isOptionSet(...)

Author: practicalswift

lib/IDE/CodeCompletion.cpp

@@ -3019,12 +3019,6 @@ class CompletionLookup final : public swift::VisibleDeclConsumer {
                                 optionSetType, conformances);
   }
 
-  bool isOptionSet(Type Ty) {
-    return Ty &&
-           Ty->getNominalOrBoundGenericNominal() &&
-           isOptionSetDecl(Ty->getNominalOrBoundGenericNominal());
-  }
-
   void getTupleExprCompletions(TupleType *ExprType) {
     unsigned Index = 0;
     for (auto TupleElt : ExprType->getElements()) {