[clang-tools-extra] [clang-tidy] Ignore `if consteval` in else-after-return (PR #91588)

[Danny Mösch via cfe-commits]

================
@@ -337,6 +337,10 @@ Changes in existing checks
   <clang-tidy/checks/readability/duplicate-include>` check by excluding include
   directives that form the filename using macro.
 
+- Improved :doc:`readability-else-after-return
+  <clang-tidy/checks/readability/else-after-return>` check to ignore
+  `consteval if` condition, where need to retain the else statement.
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SimplyDanny wrote:

```suggestion
  `if consteval` statements, for which the `else` branch must not be removed.
```

https://github.com/llvm/llvm-project/pull/91588