6483 static void checkDLLAttributeRedeclaration(Sema &S, NamedDecl *OldDecl,  in checkDLLAttributeRedeclaration()  argument
6487   if (OldDecl->isInvalidDecl() || NewDecl->isInvalidDecl())  in checkDLLAttributeRedeclaration()
6491   if (TemplateDecl *OldTD = dyn_cast<TemplateDecl>(OldDecl)) {  in checkDLLAttributeRedeclaration()
6492     OldDecl = OldTD->getTemplatedDecl();  in checkDLLAttributeRedeclaration()
6502   if (!OldDecl || !NewDecl)  in checkDLLAttributeRedeclaration()
6505   const DLLImportAttr *OldImportAttr = OldDecl->getAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
6506   const DLLExportAttr *OldExportAttr = OldDecl->getAttr<DLLExportAttr>();  in checkDLLAttributeRedeclaration()
6521   if (AddsAttr && !IsSpecialization && !OldDecl->isImplicit()) {  in checkDLLAttributeRedeclaration()
6524     if (!OldDecl->isCXXClassMember()) {  in checkDLLAttributeRedeclaration()
6525       auto *VD = dyn_cast<VarDecl>(OldDecl);  in checkDLLAttributeRedeclaration()
6528       auto *FD = dyn_cast<FunctionDecl>(OldDecl);  in checkDLLAttributeRedeclaration()
6536     if (OldDecl->isUsed())  in checkDLLAttributeRedeclaration()
6537       if (!isa<FunctionDecl>(OldDecl) || !NewImportAttr)  in checkDLLAttributeRedeclaration()
6545     S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
6578       S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
6586       S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
6588       OldDecl->dropAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
6594     OldDecl->dropAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
10421     bool &Redeclaration, NamedDecl *&OldDecl, bool &MergeTypeWithPrevious,  in CheckTargetCausesMultiVersioning()  argument
10456     OldDecl = OldFD;  in CheckTargetCausesMultiVersioning()
10495   OldDecl = nullptr;  in CheckTargetCausesMultiVersioning()
10506     bool &Redeclaration, NamedDecl *&OldDecl, bool &MergeTypeWithPrevious,  in CheckMultiVersionAdditionalDecl()  argument
10544         OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
10572           OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
10593           OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
10635     OldDecl = OldFD;  in CheckMultiVersionAdditionalDecl()
10642   OldDecl = nullptr;  in CheckMultiVersionAdditionalDecl()
10655                                       bool &Redeclaration, NamedDecl *&OldDecl,  in CheckMultiVersionFunction()  argument
10685   if (!OldDecl || !OldDecl->getAsFunction() ||  in CheckMultiVersionFunction()
10686       OldDecl->getDeclContext()->getRedeclContext() !=  in CheckMultiVersionFunction()
10695   FunctionDecl *OldFD = OldDecl->getAsFunction();  in CheckMultiVersionFunction()
10710                                             Redeclaration, OldDecl,  in CheckMultiVersionFunction()
10718       OldDecl, MergeTypeWithPrevious, Previous);  in CheckMultiVersionFunction()
10751   NamedDecl *OldDecl = nullptr;  in CheckFunctionDeclaration()  local
10765         OldDecl = Candidate;  in CheckFunctionDeclaration()
10769       switch (CheckOverload(S, NewFD, Previous, OldDecl,  in CheckFunctionDeclaration()
10793       OldDecl = Previous.getFoundDecl();  in CheckFunctionDeclaration()
10797       if (OldDecl->hasAttr<OverloadableAttr>() ||  in CheckFunctionDeclaration()
10799         if (IsOverload(NewFD, cast<FunctionDecl>(OldDecl), false)) {  in CheckFunctionDeclaration()
10802           OldDecl = nullptr;  in CheckFunctionDeclaration()
10808   if (CheckMultiVersionFunction(*this, NewFD, Redeclaration, OldDecl,  in CheckFunctionDeclaration()
10832     if (OldDecl)  in CheckFunctionDeclaration()
10833       OldMD = dyn_cast_or_null<CXXMethodDecl>(OldDecl->getAsFunction());  in CheckFunctionDeclaration()
10859     if (MergeFunctionDecl(NewFD, OldDecl, S, MergeTypeWithPrevious)) {  in CheckFunctionDeclaration()
10865     Previous.addDecl(OldDecl);  in CheckFunctionDeclaration()
10868             dyn_cast<FunctionTemplateDecl>(OldDecl)) {  in CheckFunctionDeclaration()
10902       if (shouldLinkDependentDeclWithPrevious(NewFD, OldDecl)) {  in CheckFunctionDeclaration()
10903         auto *OldFD = cast<FunctionDecl>(OldDecl);  in CheckFunctionDeclaration()