Merge pull request #19135 from CodaFi/no-substitute-for-the-real-deal

[NFC] Drop unused pending substitutions vector

Author: CodaFi

include/swift/Demangling/Demangler.h

@@ -296,7 +296,6 @@ class Demangler : public NodeFactory {
 
   Vector<NodePointer> NodeStack;
   Vector<NodePointer> Substitutions;
-  Vector<unsigned> PendingSubstitutions;
 
   static const int MaxNumWords = 26;
   StringRef Words[MaxNumWords];

lib/Demangling/Demangler.cpp

@@ -377,14 +377,12 @@ void CharVector::append(int Number, NodeFactory &Factory) {
 void Demangler::clear() {
   NodeStack.free();
   Substitutions.free();
-  PendingSubstitutions.free();
   NodeFactory::clear();
 }
 
 void Demangler::init(StringRef MangledName) {
   NodeStack.init(*this, 16);
   Substitutions.init(*this, 16);
-  PendingSubstitutions.init(*this, 4);
   NumWords = 0;
   Text = MangledName;
   Pos = 0;