[clang] [clang-tools-extra] [clang-tidy] Add support for bsl::optional (PR #101450)

[Nicolas van Kempen via cfe-commits]

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@@ -0,0 +1,38 @@
+#ifndef LLVM_CLANG_TOOLS_EXTRA_TEST_CLANG_TIDY_CHECKERS_INPUTS_BDE_TYPES_NULLABLEVALUE_H_
+#define LLVM_CLANG_TOOLS_EXTRA_TEST_CLANG_TIDY_CHECKERS_INPUTS_BDE_TYPES_NULLABLEVALUE_H_
+
+#include "bsl_optional.h"
+
+/// Mock of `bdbl::NullableValue`.
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nicovank wrote:

```suggestion
/// Mock of `bdlb::NullableValue`.
```

https://github.com/llvm/llvm-project/pull/101450