[clang] [AST][RecoveryExpr] Fix a crash on c89/c90 invalid InitListExpr (#88008) (PR #88014)

[Sam McCall via cfe-commits]

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@@ -3391,7 +3391,7 @@ class Sema final : public SemaBase {
       bool ConstexprSupported, bool CLinkageMayDiffer);
 
   /// type checking declaration initializers (C99 6.7.8)
-  bool CheckForConstantInitializer(Expr *e, QualType t);
+  bool CheckForConstantInitializer(Expr *Init, unsigned DiagID);
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sam-mccall wrote:

you could consider adding a default for DiagID as there's an "obvious" one used in most places. Up to you.

https://github.com/llvm/llvm-project/pull/88014