[clang][TableGen] Change Builtins emitter to use const RecordKeeper (llvm#108195)

Change Builtins emitter 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/ClangBuiltinsEmitter.cpp

@@ -345,7 +345,7 @@ void EmitBuiltin(llvm::raw_ostream &OS, const Record *Builtin) {
 }
 } // namespace
 
-void clang::EmitClangBuiltins(llvm::RecordKeeper &Records,
+void clang::EmitClangBuiltins(const llvm::RecordKeeper &Records,
                               llvm::raw_ostream &OS) {
   emitSourceFileHeader("List of builtins that Clang recognizes", OS);
 

clang/utils/TableGen/TableGenBackends.h

@@ -73,7 +73,8 @@ void EmitClangAttrNodeTraverse(llvm::RecordKeeper &Records,
                                llvm::raw_ostream &OS);
 void EmitClangAttrDocTable(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
 
-void EmitClangBuiltins(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
+void EmitClangBuiltins(const llvm::RecordKeeper &Records,
+                       llvm::raw_ostream &OS);
 
 void EmitClangDiagsDefs(llvm::RecordKeeper &Records, llvm::raw_ostream &OS,
                         const std::string &Component);