[clang-tools-extra] [clang-tidy] Add llvm-regex check (PR #207407)

[via cfe-commits]

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+.. title:: clang-tidy - llvm-regex
+
+llvm-regex
+==========
+
+The checker detects malformed regex patterns defined in a single string literal
+to catch mistakes at compile time.
+It detects these string literals if they are defined in the regex constructor
+with a string literal, or stored in one of these non mutable container:
+
+- ``const std::string``
+- ``const char*``
+- ``const llvm::StringRef``
+- ``std::string_view``
+
+In the event that the patterns are stored as a class member, the check checks
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EugeneZelenko wrote:

Something better than `check checks`, please.

https://github.com/llvm/llvm-project/pull/207407