AST: Don't clone TypeReprs in ParamDecl::cloneWithoutType()

Author: slavapestov

lib/AST/Decl.cpp

@@ -6112,8 +6112,6 @@ ParamDecl *ParamDecl::cloneWithoutType(const ASTContext &Ctx, ParamDecl *PD) {
       nullptr, PD->DefaultValueAndFlags.getInt());
   Clone->Bits.ParamDecl.defaultArgumentKind =
       PD->Bits.ParamDecl.defaultArgumentKind;
-  if (auto *repr = PD->getTypeRepr())
-    Clone->setTypeRepr(repr->clone(Ctx));
 
   Clone->setSpecifier(PD->getSpecifier());
   Clone->setImplicitlyUnwrappedOptional(PD->isImplicitlyUnwrappedOptional());