6949 static void checkDLLAttributeRedeclaration(Sema &S, NamedDecl *OldDecl,  in checkDLLAttributeRedeclaration()  argument
6953   if (OldDecl->isInvalidDecl() || NewDecl->isInvalidDecl())  in checkDLLAttributeRedeclaration()
6957   if (TemplateDecl *OldTD = dyn_cast<TemplateDecl>(OldDecl)) {  in checkDLLAttributeRedeclaration()
6958     OldDecl = OldTD->getTemplatedDecl();  in checkDLLAttributeRedeclaration()
6968   if (!OldDecl || !NewDecl)  in checkDLLAttributeRedeclaration()
6971   const DLLImportAttr *OldImportAttr = OldDecl->getAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
6972   const DLLExportAttr *OldExportAttr = OldDecl->getAttr<DLLExportAttr>();  in checkDLLAttributeRedeclaration()
6987   if (AddsAttr && !IsSpecialization && !OldDecl->isImplicit()) {  in checkDLLAttributeRedeclaration()
6990     if (!OldDecl->isCXXClassMember()) {  in checkDLLAttributeRedeclaration()
6991       auto *VD = dyn_cast<VarDecl>(OldDecl);  in checkDLLAttributeRedeclaration()
6994       auto *FD = dyn_cast<FunctionDecl>(OldDecl);  in checkDLLAttributeRedeclaration()
7002     if (OldDecl->isUsed())  in checkDLLAttributeRedeclaration()
7003       if (!isa<FunctionDecl>(OldDecl) || !NewImportAttr)  in checkDLLAttributeRedeclaration()
7011     S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
7051         S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
7063       S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);  in checkDLLAttributeRedeclaration()
7065       OldDecl->dropAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
7071     OldDecl->dropAttr<DLLImportAttr>();  in checkDLLAttributeRedeclaration()
11299                                                   NamedDecl *&OldDecl,  in CheckDeclarationCausesMultiVersioning()  argument
11339     OldDecl = OldFD;  in CheckDeclarationCausesMultiVersioning()
11388   OldDecl = nullptr;  in CheckDeclarationCausesMultiVersioning()
11427     const TargetClonesAttr *NewClones, bool &Redeclaration, NamedDecl *&OldDecl,  in CheckMultiVersionAdditionalDecl()  argument
11485         OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
11506           OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
11575       OldDecl = CurFD;  in CheckMultiVersionAdditionalDecl()
11597           OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
11617           OldDecl = ND;  in CheckMultiVersionAdditionalDecl()
11660     OldDecl = OldFD;  in CheckMultiVersionAdditionalDecl()
11666   OldDecl = nullptr;  in CheckMultiVersionAdditionalDecl()
11678                                       bool &Redeclaration, NamedDecl *&OldDecl,  in CheckMultiVersionFunction()  argument
11712   if (!OldDecl || !OldDecl->getAsFunction() ||  in CheckMultiVersionFunction()
11713       !OldDecl->getDeclContext()->getRedeclContext()->Equals(  in CheckMultiVersionFunction()
11722   FunctionDecl *OldFD = OldDecl->getAsFunction();  in CheckMultiVersionFunction()
11743           S, OldFD, NewFD, Redeclaration, OldDecl, Previous);  in CheckMultiVersionFunction()
11764                                          OldDecl, Previous);  in CheckMultiVersionFunction()
11807   NamedDecl *OldDecl = nullptr;  in CheckFunctionDeclaration()  local
11821         OldDecl = Candidate;  in CheckFunctionDeclaration()
11825       switch (CheckOverload(S, NewFD, Previous, OldDecl,  in CheckFunctionDeclaration()
11849       OldDecl = Previous.getFoundDecl();  in CheckFunctionDeclaration()
11853       if (OldDecl->hasAttr<OverloadableAttr>() ||  in CheckFunctionDeclaration()
11855         if (IsOverload(NewFD, cast<FunctionDecl>(OldDecl), false)) {  in CheckFunctionDeclaration()
11858           OldDecl = nullptr;  in CheckFunctionDeclaration()
11864   if (CheckMultiVersionFunction(*this, NewFD, Redeclaration, OldDecl, Previous))  in CheckFunctionDeclaration()
11918     if (OldDecl)  in CheckFunctionDeclaration()
11919       OldMD = dyn_cast_or_null<CXXMethodDecl>(OldDecl->getAsFunction());  in CheckFunctionDeclaration()
11945     if (MergeFunctionDecl(NewFD, OldDecl, S, MergeTypeWithPrevious,  in CheckFunctionDeclaration()
11952     Previous.addDecl(OldDecl);  in CheckFunctionDeclaration()
11955             dyn_cast<FunctionTemplateDecl>(OldDecl)) {  in CheckFunctionDeclaration()
11989       if (shouldLinkDependentDeclWithPrevious(NewFD, OldDecl)) {  in CheckFunctionDeclaration()
11990         auto *OldFD = cast<FunctionDecl>(OldDecl);  in CheckFunctionDeclaration()