[clang] [Clang] Avoid null deref in lambda attribute compat warning (PR #161096)

[Corentin Jabot via cfe-commits]

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@@ -1147,7 +1147,7 @@ def ext_lambda_missing_parens : ExtWarn<
   "lambda without a parameter clause is a C++23 extension">,
   InGroup<CXX23>;
 def warn_cxx20_compat_decl_attrs_on_lambda : Warning<
-  "%select{an attribute specifier sequence|%1}0 in this position "
+  "%select{an attribute specifier sequence|%0}1 in this position "
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cor3ntin wrote:

> Should both be normalized to use %0 for the selector and %1 for the attr name?

Yes, i think this would be best

https://github.com/llvm/llvm-project/pull/161096