[clang] [clang-repl] Address error recovery fixing infinite loop while parsing (PR #127569)

[Vassil Vassilev via cfe-commits]

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@@ -721,6 +721,16 @@ class Parser : public CodeCompletionHandler {
            Kind == tok::annot_repl_input_end;
   }
 
+  /// Determine if the given token marks the end of the current parsing unit.
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vgvassilev wrote:

```suggestion
  /// Determine if the given token marks the end of the current partial translation unit.
```

https://github.com/llvm/llvm-project/pull/127569