[llvm] [NFC][llvm] Fix incomplete type issues in LLVM (PR #182655)

[Jakub Kuderski via llvm-commits]

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@@ -1221,6 +1221,9 @@ class indexed_accessor_range_base {
   class iterator : public indexed_accessor_iterator<iterator, BaseT, T,
                                                     PointerT, ReferenceT> {
   public:
+    iterator()
+        : indexed_accessor_iterator<iterator, BaseT, T, std::remove_cv_t<T>, T>(
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kuhar wrote:

This should also work, no?
```suggestion
        : indexed_accessor_iterator(
```

https://github.com/llvm/llvm-project/pull/182655