[NFC] Use isa<...> to replace isa<>||isa<> in clang/Serialization

Now isa supports the variant args, which could simplify the codes
further. This patch simplify the uses in clang/Serialization

clang/lib/Serialization/ASTCommon.cpp

@@ -474,7 +474,7 @@ bool serialization::needsAnonymousDeclarationNumber(const NamedDecl *D) {
     if (auto *VD = dyn_cast<VarDecl>(D))
       return VD->isStaticLocal();
     // FIXME: What about CapturedDecls (and declarations nested within them)?
-    return isa<TagDecl>(D) || isa<BlockDecl>(D);
+    return isa<TagDecl, BlockDecl>(D);
   }
 
   // Otherwise, we only care about anonymous class members / block-scope decls.
@@ -484,5 +484,5 @@ bool serialization::needsAnonymousDeclarationNumber(const NamedDecl *D) {
     return false;
   if (!isa<RecordDecl, ObjCInterfaceDecl>(D->getLexicalDeclContext()))
     return false;
-  return isa<TagDecl>(D) || isa<FieldDecl>(D);
+  return isa<TagDecl, FieldDecl>(D);
 }

clang/lib/Serialization/ASTReader.cpp

@@ -7229,8 +7229,7 @@ void ASTReader::CompleteRedeclChain(const Decl *D) {
   //
   // FIXME: Merging a function definition should merge
   // all mergeable entities within it.
-  if (isa<TranslationUnitDecl>(DC) || isa<NamespaceDecl>(DC) ||
-      isa<CXXRecordDecl>(DC) || isa<EnumDecl>(DC)) {
+  if (isa<TranslationUnitDecl, NamespaceDecl, CXXRecordDecl, EnumDecl>(DC)) {
     if (DeclarationName Name = cast<NamedDecl>(D)->getDeclName()) {
       if (!getContext().getLangOpts().CPlusPlus &&
           isa<TranslationUnitDecl>(DC)) {

clang/lib/Serialization/ASTReaderDecl.cpp

@@ -567,7 +567,7 @@ void ASTDeclReader::Visit(Decl *D) {
 
 void ASTDeclReader::VisitDecl(Decl *D) {
   if (D->isTemplateParameter() || D->isTemplateParameterPack() ||
-      isa<ParmVarDecl>(D) || isa<ObjCTypeParamDecl>(D)) {
+      isa<ParmVarDecl, ObjCTypeParamDecl>(D)) {
     // We don't want to deserialize the DeclContext of a template
     // parameter or of a parameter of a function template immediately.   These
     // entities might be used in the formulation of its DeclContext (for
@@ -3021,16 +3021,11 @@ static bool isConsumerInterestedIn(ASTContext &Ctx, Decl *D, bool HasBody) {
       return false;
   }
 
-  if (isa<FileScopeAsmDecl>(D) ||
-      isa<ObjCProtocolDecl>(D) ||
-      isa<ObjCImplDecl>(D) ||
-      isa<ImportDecl>(D) ||
-      isa<PragmaCommentDecl>(D) ||
-      isa<PragmaDetectMismatchDecl>(D))
+  if (isa<FileScopeAsmDecl, ObjCProtocolDecl, ObjCImplDecl, ImportDecl,
+          PragmaCommentDecl, PragmaDetectMismatchDecl>(D))
     return true;
-  if (isa<OMPThreadPrivateDecl>(D) || isa<OMPDeclareReductionDecl>(D) ||
-      isa<OMPDeclareMapperDecl>(D) || isa<OMPAllocateDecl>(D) ||
-      isa<OMPRequiresDecl>(D))
+  if (isa<OMPThreadPrivateDecl, OMPDeclareReductionDecl, OMPDeclareMapperDecl,
+          OMPAllocateDecl, OMPRequiresDecl>(D))
     return !D->getDeclContext()->isFunctionOrMethod();
   if (const auto *Var = dyn_cast<VarDecl>(D))
     return Var->isFileVarDecl() &&
@@ -4049,7 +4044,7 @@ void ASTReader::loadDeclUpdateRecords(PendingUpdateRecord &Record) {
   }
   // Add the lazy specializations to the template.
   assert((PendingLazySpecializationIDs.empty() || isa<ClassTemplateDecl>(D) ||
-          isa<FunctionTemplateDecl>(D) || isa<VarTemplateDecl>(D)) &&
+          isa<FunctionTemplateDecl, VarTemplateDecl>(D)) &&
          "Must not have pending specializations");
   if (auto *CTD = dyn_cast<ClassTemplateDecl>(D))
     ASTDeclReader::AddLazySpecializations(CTD, PendingLazySpecializationIDs);

clang/lib/Serialization/ASTWriter.cpp

@@ -5471,7 +5471,7 @@ void ASTWriter::associateDeclWithFile(const Decl *D, DeclID ID) {
   // a function/objc method, should not have TU as lexical context.
   // TemplateTemplateParmDecls that are part of an alias template, should not
   // have TU as lexical context.
-  if (isa<ParmVarDecl>(D) || isa<TemplateTemplateParmDecl>(D))
+  if (isa<ParmVarDecl, TemplateTemplateParmDecl>(D))
     return;
 
   SourceManager &SM = Context->getSourceManager();

clang/lib/Serialization/ASTWriterDecl.cpp

@@ -2417,7 +2417,7 @@ static bool isRequiredDecl(const Decl *D, ASTContext &Context,
 
   // File scoped assembly or obj-c or OMP declare target implementation must be
   // seen.
-  if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
+  if (isa<FileScopeAsmDecl, ObjCImplDecl>(D))
     return true;
 
   if (WritingModule && isPartOfPerModuleInitializer(D)) {