[clang][TableGen] Change TypeNodesEmitter to use const RecordKeeper (#108476)

Change TypeNodesEmitter to use const RecordKeeper.

This is a part of effort to have better const correctness in TableGen
backends:


https://discourse.llvm.org/t/psa-planned-changes-to-tablegen-getallderiveddefinitions-api-potential-downstream-breakages/81089

Author: jurahul

clang/utils/TableGen/ClangTypeNodesEmitter.cpp

@@ -74,16 +74,15 @@ using namespace clang::tblgen;
 
 namespace {
 class TypeNodeEmitter {
-  RecordKeeper &Records;
+  const RecordKeeper &Records;
   raw_ostream &Out;
-  const std::vector<Record*> Types;
+  ArrayRef<const Record *> Types;
   std::vector<StringRef> MacrosToUndef;
 
 public:
-  TypeNodeEmitter(RecordKeeper &records, raw_ostream &out)
-    : Records(records), Out(out),
-      Types(Records.getAllDerivedDefinitions(TypeNodeClassName)) {
-  }
+  TypeNodeEmitter(const RecordKeeper &records, raw_ostream &out)
+      : Records(records), Out(out),
+        Types(Records.getAllDerivedDefinitions(TypeNodeClassName)) {}
 
   void emit();
 
@@ -203,6 +202,6 @@ void TypeNodeEmitter::emitUndefs() {
   }
 }
 
-void clang::EmitClangTypeNodes(RecordKeeper &records, raw_ostream &out) {
+void clang::EmitClangTypeNodes(const RecordKeeper &records, raw_ostream &out) {
   TypeNodeEmitter(records, out).emit();
 }

clang/utils/TableGen/TableGenBackends.h

@@ -39,7 +39,8 @@ void EmitClangBasicReader(const llvm::RecordKeeper &Records,
                           llvm::raw_ostream &OS);
 void EmitClangBasicWriter(const llvm::RecordKeeper &Records,
                           llvm::raw_ostream &OS);
-void EmitClangTypeNodes(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
+void EmitClangTypeNodes(const llvm::RecordKeeper &Records,
+                        llvm::raw_ostream &OS);
 void EmitClangTypeReader(const llvm::RecordKeeper &Records,
                          llvm::raw_ostream &OS);
 void EmitClangTypeWriter(const llvm::RecordKeeper &Records,