[llvm] [NFC][ADT] Format StringRefTest.cpp to fit in 80 columns. (PR #105502)

[Sergei Barannikov via llvm-commits]

https://github.com/s-barannikov approved this pull request.

LGTM assuming this is formatted with clang-format and not manually

https://github.com/llvm/llvm-project/pull/105502