[PATCH] D68914: [clang-format] Remove duplciate code from Invalid BOM detection

[Owen Pan via Phabricator via cfe-commits]

owenpan added a comment.

I did a quick search of the LLVM code base and found dozens of `const StringRef &`, including the `Twine` API <https://github.com/llvm/llvm-project/blob/master/llvm/include/llvm/ADT/Twine.h#L524>.


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