[llvm] [ADT] Add std::string_view conversion to SmallString (PR #83397)

[Jakub Kuderski via llvm-commits]

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@@ -265,6 +265,11 @@ class SmallString : public SmallVector<char, InternalLen> {
   /// Implicit conversion to StringRef.
   operator StringRef() const { return str(); }
 
+  /// Implicit conversion to std::string_view
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kuhar wrote:

nit
```suggestion
  /// Implicit conversion to std::string_view.
```

https://github.com/llvm/llvm-project/pull/83397