[clang] Use *(Set|Map)::contains (NFC) (#138464)

clang/lib/AST/DeclBase.cpp

@@ -2149,8 +2149,7 @@ void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) {
   // have already checked the external source.
   if (!Internal)
     if (ExternalASTSource *Source = getParentASTContext().getExternalSource())
-      if (hasExternalVisibleStorage() &&
-          Map->find(D->getDeclName()) == Map->end())
+      if (hasExternalVisibleStorage() && !Map->contains(D->getDeclName()))
         Source->FindExternalVisibleDeclsByName(this, D->getDeclName(),
                                                D->getDeclContext());
 

clang/lib/Serialization/ASTReader.cpp

@@ -8646,9 +8646,8 @@ ASTReader::getLoadedSpecializationsLookupTables(const Decl *D, bool IsPartial) {
 
 bool ASTReader::haveUnloadedSpecializations(const Decl *D) const {
   assert(D->isCanonicalDecl());
-  return (PartialSpecializationsLookups.find(D) !=
-          PartialSpecializationsLookups.end()) ||
-         (SpecializationsLookups.find(D) != SpecializationsLookups.end());
+  return PartialSpecializationsLookups.contains(D) ||
+         SpecializationsLookups.contains(D);
 }
 
 /// Under non-PCH compilation the consumer receives the objc methods

clang/tools/libclang/CXCursor.cpp

@@ -1638,7 +1638,7 @@ unsigned clang_CXCursorSet_contains(CXCursorSet set, CXCursor cursor) {
   CXCursorSet_Impl *setImpl = unpackCXCursorSet(set);
   if (!setImpl)
     return 0;
-  return setImpl->find(cursor) != setImpl->end();
+  return setImpl->contains(cursor);
 }
 
 unsigned clang_CXCursorSet_insert(CXCursorSet set, CXCursor cursor) {

clang/utils/TableGen/ClangBuiltinTemplatesEmitter.cpp

@@ -60,10 +60,8 @@ ParseTemplateParameterList(ParserState &PS,
     } else if (Arg->isSubClassOf("NTTP")) {
       auto Type = Arg->getValueAsString("TypeName");
 
-      if (TemplateNameToParmName.find(Type.str()) ==
-          TemplateNameToParmName.end()) {
+      if (!TemplateNameToParmName.contains(Type.str()))
         PrintFatalError("Unkown Type Name");
-      }
 
       auto TSIName = "TSI" + std::to_string(PS.UniqueCounter++);
       Code << " auto *" << TSIName << " = C.getTrivialTypeSourceInfo(QualType("