[Index] Remove unused function (NFC) (#65334)

Author: keith

lib/Index/Index.cpp

@@ -965,7 +965,6 @@ class IndexSwiftASTWalker : public SourceEntityWalker {
   bool reportRelatedTypeRef(const TypeLoc &Ty, SymbolRoleSet Relations, Decl *Related);
   bool reportInheritedTypeRefs(
       ArrayRef<InheritedEntry> Inherited, Decl *Inheritee);
-  NominalTypeDecl *getTypeLocAsNominalTypeDecl(const TypeLoc &Ty);
 
   bool reportPseudoGetterDecl(VarDecl *D) {
     return reportPseudoAccessor(D, AccessorKind::Get, /*IsRef=*/false,
@@ -1474,17 +1473,6 @@ bool IndexSwiftASTWalker::reportPseudoAccessor(AbstractStorageDecl *D,
   return !Cancelled;
 }
 
-NominalTypeDecl *
-IndexSwiftASTWalker::getTypeLocAsNominalTypeDecl(const TypeLoc &Ty) {
-  if (Type T = Ty.getType())
-    return T->getAnyNominal();
-  if (auto *declRefTR = dyn_cast_or_null<DeclRefTypeRepr>(Ty.getTypeRepr())) {
-    if (auto NTD = dyn_cast_or_null<NominalTypeDecl>(declRefTR->getBoundDecl()))
-      return NTD;
-  }
-  return nullptr;
-}
-
 bool IndexSwiftASTWalker::reportExtension(ExtensionDecl *D) {
   SourceLoc Loc = getLocForExtension(D);
   NominalTypeDecl *NTD = D->getExtendedNominal();