6924 static void checkDLLAttributeRedeclaration(Sema &S, NamedDecl *OldDecl,  in checkDLLAttributeRedeclaration()  argument
6928   if (OldDecl->isInvalidDecl() || NewDecl->isInvalidDecl())  in checkDLLAttributeRedeclaration()
6932   if (TemplateDecl *OldTD = dyn_cast<TemplateDecl>(OldDecl)) {  in checkDLLAttributeRedeclaration()
6933     OldDecl = OldTD->getTemplatedDecl();  in checkDLLAttributeRedeclaration()
6943   if (!OldDecl || !NewDecl)  in checkDLLAttributeRedeclaration()
6946   const DLLImportAttr *OldImportAttr = OldDecl->getAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
6947   const DLLExportAttr *OldExportAttr = OldDecl->getAttr<DLLExportAttr>();  in checkDLLAttributeRedeclaration()
6962   if (AddsAttr && !IsSpecialization && !OldDecl->isImplicit()) {  in checkDLLAttributeRedeclaration()
6965     if (!OldDecl->isCXXClassMember()) {  in checkDLLAttributeRedeclaration()
6966       auto *VD = dyn_cast<VarDecl>(OldDecl);  in checkDLLAttributeRedeclaration()
6969       auto *FD = dyn_cast<FunctionDecl>(OldDecl);  in checkDLLAttributeRedeclaration()
6977     if (OldDecl->isUsed())  in checkDLLAttributeRedeclaration()
6978       if (!isa<FunctionDecl>(OldDecl) || !NewImportAttr)  in checkDLLAttributeRedeclaration()
6986     S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
7019       S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
7027       S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
7029       OldDecl->dropAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
7035     OldDecl->dropAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
10928     bool &Redeclaration, NamedDecl *&OldDecl, LookupResult &Previous) {  in CheckTargetCausesMultiVersioning()  argument
10955     OldDecl = OldFD;  in CheckTargetCausesMultiVersioning()
10993   OldDecl = nullptr;  in CheckTargetCausesMultiVersioning()
11016     const TargetClonesAttr *NewClones, bool &Redeclaration, NamedDecl *&OldDecl,  in CheckMultiVersionAdditionalDecl()  argument
11060         OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
11076       OldDecl = CurFD;  in CheckMultiVersionAdditionalDecl()
11110           OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
11130           OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
11172     OldDecl = OldFD;  in CheckMultiVersionAdditionalDecl()
11178   OldDecl = nullptr;  in CheckMultiVersionAdditionalDecl()
11190                                       bool &Redeclaration, NamedDecl *&OldDecl,  in CheckMultiVersionFunction()  argument
11210   if (!OldDecl || !OldDecl->getAsFunction() ||  in CheckMultiVersionFunction()
11211       OldDecl->getDeclContext()->getRedeclContext() !=  in CheckMultiVersionFunction()
11220   FunctionDecl *OldFD = OldDecl->getAsFunction();  in CheckMultiVersionFunction()
11239                                               Redeclaration, OldDecl, Previous);  in CheckMultiVersionFunction()
11259                                          Redeclaration, OldDecl, Previous);  in CheckMultiVersionFunction()
11293   NamedDecl *OldDecl = nullptr;  in CheckFunctionDeclaration()  local
11307         OldDecl = Candidate;  in CheckFunctionDeclaration()
11311       switch (CheckOverload(S, NewFD, Previous, OldDecl,  in CheckFunctionDeclaration()
11335       OldDecl = Previous.getFoundDecl();  in CheckFunctionDeclaration()
11339       if (OldDecl->hasAttr<OverloadableAttr>() ||  in CheckFunctionDeclaration()
11341         if (IsOverload(NewFD, cast<FunctionDecl>(OldDecl), false)) {  in CheckFunctionDeclaration()
11344           OldDecl = nullptr;  in CheckFunctionDeclaration()
11350   if (CheckMultiVersionFunction(*this, NewFD, Redeclaration, OldDecl, Previous))  in CheckFunctionDeclaration()
11373     if (OldDecl)  in CheckFunctionDeclaration()
11374       OldMD = dyn_cast_or_null<CXXMethodDecl>(OldDecl->getAsFunction());  in CheckFunctionDeclaration()
11400     if (MergeFunctionDecl(NewFD, OldDecl, S, MergeTypeWithPrevious,  in CheckFunctionDeclaration()
11407     Previous.addDecl(OldDecl);  in CheckFunctionDeclaration()
11410             dyn_cast<FunctionTemplateDecl>(OldDecl)) {  in CheckFunctionDeclaration()
11444       if (shouldLinkDependentDeclWithPrevious(NewFD, OldDecl)) {  in CheckFunctionDeclaration()
11445         auto *OldFD = cast<FunctionDecl>(OldDecl);  in CheckFunctionDeclaration()