[clang] [Sema] Diagnose use of if/else-if condition variable inside else-if/else branch(s) (PR #156436)

[via cfe-commits]

================
@@ -13594,6 +13594,9 @@ def warn_acc_var_referenced_lacks_op
               "reference has no effect">,
       InGroup<DiagGroup<"openacc-var-lacks-operation">>,
       DefaultError;
+def warn_out_of_scope_var_usage
+    : Warning<"variable %0 used in else/else if block is out of scope">,
----------------
Sirraide wrote:

```suggestion
    : Warning<"variable %0 used in 'else'/'else if' block is out of scope">,
```

https://github.com/llvm/llvm-project/pull/156436
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