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

[Owen Pan via Phabricator via cfe-commits]

owenpan added a comment.

Here are some `const StringRef &` examples <https://github.com/llvm/llvm-project/blob/master/clang/lib/StaticAnalyzer/Checkers/IteratorChecker.cpp#L229>.


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