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Summary: Add documentation for the LLVM Support functions `openFileForWrite` and `openFileForRead`. The `openFileForRead` parameter `RealPath`, in particular, I think warranted some explanation. In addition, make the behavior of the functions more consistent across platforms. Prior to this patch, Windows would set or not set the result file descriptor based on the nature of the error, whereas Unix would consistently set it to `-1` if the open failed. Make Windows consistently set it to `-1` as well. Test Plan: 1. `ninja check-llvm` 2. `ninja docs-llvm-html` Reviewers: zturner, rnk, danielmartin, scanon Reviewed By: danielmartin, scanon Subscribers: scanon, danielmartin, llvm-commits Differential Revision: https://reviews.llvm.org/D46499 llvm-svn: 332075
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