7147 static void checkDLLAttributeRedeclaration(Sema &S, NamedDecl *OldDecl,  in checkDLLAttributeRedeclaration()  argument
7151   if (OldDecl->isInvalidDecl() || NewDecl->isInvalidDecl())  in checkDLLAttributeRedeclaration()
7155   if (TemplateDecl *OldTD = dyn_cast<TemplateDecl>(OldDecl)) {  in checkDLLAttributeRedeclaration()
7156     OldDecl = OldTD->getTemplatedDecl();  in checkDLLAttributeRedeclaration()
7166   if (!OldDecl || !NewDecl)  in checkDLLAttributeRedeclaration()
7169   const DLLImportAttr *OldImportAttr = OldDecl->getAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
7170   const DLLExportAttr *OldExportAttr = OldDecl->getAttr<DLLExportAttr>();  in checkDLLAttributeRedeclaration()
7185   if (AddsAttr && !IsSpecialization && !OldDecl->isImplicit()) {  in checkDLLAttributeRedeclaration()
7188     if (!OldDecl->isCXXClassMember()) {  in checkDLLAttributeRedeclaration()
7189       auto *VD = dyn_cast<VarDecl>(OldDecl);  in checkDLLAttributeRedeclaration()
7192       auto *FD = dyn_cast<FunctionDecl>(OldDecl);  in checkDLLAttributeRedeclaration()
7200     if (OldDecl->isUsed())  in checkDLLAttributeRedeclaration()
7201       if (!isa<FunctionDecl>(OldDecl) || !NewImportAttr)  in checkDLLAttributeRedeclaration()
7209     S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
7249         S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
7261       S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
7263       OldDecl->dropAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
7269     OldDecl->dropAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
11388                                              NamedDecl *&OldDecl,  in CheckTargetCausesMultiVersioning()  argument
11420     OldDecl = OldFD;  in CheckTargetCausesMultiVersioning()
11485   OldDecl = nullptr;  in CheckTargetCausesMultiVersioning()
11508     bool &Redeclaration, NamedDecl *&OldDecl, LookupResult &Previous) {  in CheckMultiVersionAdditionalDecl()  argument
11571         OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
11592         OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
11611       OldDecl = CurFD;  in CheckMultiVersionAdditionalDecl()
11645           OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
11665           OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
11708     OldDecl = OldFD;  in CheckMultiVersionAdditionalDecl()
11714   OldDecl = nullptr;  in CheckMultiVersionAdditionalDecl()
11726                                       bool &Redeclaration, NamedDecl *&OldDecl,  in CheckMultiVersionFunction()  argument
11754   if (!OldDecl || !OldDecl->getAsFunction() ||  in CheckMultiVersionFunction()
11755       OldDecl->getDeclContext()->getRedeclContext() !=  in CheckMultiVersionFunction()
11764   FunctionDecl *OldFD = OldDecl->getAsFunction();  in CheckMultiVersionFunction()
11779       OldDecl = OldFD;  in CheckMultiVersionFunction()
11801                                               OldDecl, Previous);  in CheckMultiVersionFunction()
11822                                          OldDecl, Previous);  in CheckMultiVersionFunction()
11882   NamedDecl *OldDecl = nullptr;  in CheckFunctionDeclaration()  local
11896         OldDecl = Candidate;  in CheckFunctionDeclaration()
11900       switch (CheckOverload(S, NewFD, Previous, OldDecl,  in CheckFunctionDeclaration()
11924       OldDecl = Previous.getFoundDecl();  in CheckFunctionDeclaration()
11928       if (OldDecl->hasAttr<OverloadableAttr>() ||  in CheckFunctionDeclaration()
11930         if (IsOverload(NewFD, cast<FunctionDecl>(OldDecl), false)) {  in CheckFunctionDeclaration()
11933           OldDecl = nullptr;  in CheckFunctionDeclaration()
11939   if (CheckMultiVersionFunction(*this, NewFD, Redeclaration, OldDecl, Previous))  in CheckFunctionDeclaration()
11964     if (OldDecl)  in CheckFunctionDeclaration()
11965       OldMD = dyn_cast_or_null<CXXMethodDecl>(OldDecl->getAsFunction());  in CheckFunctionDeclaration()
11991     if (MergeFunctionDecl(NewFD, OldDecl, S, MergeTypeWithPrevious,  in CheckFunctionDeclaration()
11998     Previous.addDecl(OldDecl);  in CheckFunctionDeclaration()
12001             dyn_cast<FunctionTemplateDecl>(OldDecl)) {  in CheckFunctionDeclaration()
12035       if (shouldLinkDependentDeclWithPrevious(NewFD, OldDecl)) {  in CheckFunctionDeclaration()
12036         auto *OldFD = cast<FunctionDecl>(OldDecl);  in CheckFunctionDeclaration()