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
Check the path length limit against the length of the UTF-16 version of the input rather than the UTF-8 equivalent, as the UTF-16 length may be shorter. Move widenPath from the llvm::sys::path namespace in Path.h to the llvm::sys::windows namespace in WindowsSupport.h. Only use the reduced path length limit for create directory. Canonicalize using sys::path::remove_dots(). Differential Revision: https://reviews.llvm.org/D75372