[clang] [clang][ExprConst] Fix crash on uninitialized array subobject (PR #67817)

[via cfe-commits]

================
@@ -404,7 +404,7 @@ bool CheckPure(InterpState &S, CodePtr OpPC, const CXXMethodDecl *MD) {
 static void DiagnoseUninitializedSubobject(InterpState &S, const SourceInfo &SI,
                                            const FieldDecl *SubObjDecl) {
   assert(SubObjDecl && "Subobject declaration does not exist");
-  S.FFDiag(SI, diag::note_constexpr_uninitialized) << SubObjDecl;
+  S.FFDiag(SI, diag::note_constexpr_uninitialized) << true << SubObjDecl;
----------------
cor3ntin wrote:

Can you add a comment before true ? and maybe use an integer instead `<< /* of type */ 1 << ` - same in other places

https://github.com/llvm/llvm-project/pull/67817