[clang] Remove delayed typo expressions (PR #143423)

[Eli Friedman via cfe-commits]

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@@ -1888,10 +1888,11 @@ namespace PR15884 {
 }
 
 namespace AfterError {
-  constexpr int error() {
+  constexpr int error() { // pre-cxx23-error {{no return statement in constexpr function}}
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efriedma-quic wrote:

It would be nice to suppress this diagnostic: if we discard a "return" statement, we shouldn't be complaining that constexpr eval of the function fails.

https://github.com/llvm/llvm-project/pull/143423