Initialize ConceptReference of new AutoTypeLoc with nullptr.

Differential Revision: https://reviews.llvm.org/D159450

Author: jensmassberg

clang/lib/Sema/TreeTransform.h

@@ -6860,6 +6860,7 @@ QualType TreeTransform<Derived>::TransformAutoType(TypeLocBuilder &TLB,
   AutoTypeLoc NewTL = TLB.push<AutoTypeLoc>(Result);
   NewTL.setNameLoc(TL.getNameLoc());
   NewTL.setRParenLoc(TL.getRParenLoc());
+  NewTL.setConceptReference(nullptr);
 
   if (T->isConstrained()) {
     DeclarationNameInfo DNI = DeclarationNameInfo(