[clang] [llvm] [Clang] Add __builtin_assume_dereferenceable to encode deref assumption. (PR #121789)

[Erich Keane via llvm-commits]

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@@ -2761,6 +2761,41 @@ etc.).
 
 Query for this feature with ``__has_builtin(__builtin_assume_separate_storage)``.
 
+``__builtin_assume_dereferenceable``
+-------------------------------------
+
+``__builtin_assume_derefernceable`` is used to provide the optimizer with the
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erichkeane wrote:

```suggestion
``__builtin_assume_dereferenceable`` is used to provide the optimizer with the
```

https://github.com/llvm/llvm-project/pull/121789