[clang-tools-extra] [clang-tidy] Speed up/rewrite `bugprone-stringview-nullptr` (PR #192889)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang-tools-extra/clang-tidy/bugprone/StringviewNullptrCheck.cpp clang-tools-extra/clang-tidy/bugprone/StringviewNullptrCheck.h clang-tools-extra/test/clang-tidy/checkers/bugprone/stringview-nullptr.cpp --diff_from_common_commit
``````````

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changing `origin/main` to the base branch/commit you want to compare against.
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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clang-tidy/bugprone/StringviewNullptrCheck.h b/clang-tools-extra/clang-tidy/bugprone/StringviewNullptrCheck.h
index eb37e2a83..4afc054c7 100644
--- a/clang-tools-extra/clang-tidy/bugprone/StringviewNullptrCheck.h
+++ b/clang-tools-extra/clang-tidy/bugprone/StringviewNullptrCheck.h
@@ -14,8 +14,9 @@
 namespace clang::tidy::bugprone {
 
 /// Finds cases where the ``const CharT*`` constructor of
-/// ``std::basic_string_view`` is passed a null pointer argument and replaces them
-/// with calls to the default constructor or construction from the empty string
+/// ``std::basic_string_view`` is passed a null pointer argument and replaces
+/// them with calls to the default constructor or construction from the empty
+/// string
 /// (``""``) as appropriate.
 ///
 /// For the user-facing documentation see:

``````````

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https://github.com/llvm/llvm-project/pull/192889