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Duncan P. N. Exon Smith
16e01a193c
Update llvm::sys::fs::mapped_file_region to have a move constructor and a move assignment operator, allowing it to be used as an Optional. Also, update FileOutputBuffer's OnDiskBuffer to take advantage of this, avoiding an extra allocation from the unique_ptr. A nice follow-up would be to make the mapped_file_region constructor private and replace its use with a factory function, such as mapped_file_region::create(), that returns an Expected (or ErrorOr). I don't plan on doing that immediately, but I might swing back later. No functionality change, besides the saved allocation in OnDiskBuffer. Differential Revision: https://reviews.llvm.org/D100159