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I notice that phabricator has http://reviews.llvm.org/file/ which can hold files. I haven't tested the limit, but it seems like it handled a 26MB file fine (the particular file was just from a random LLD bugzilla bug). So it is probably a good idea to document somewhere that http://reviews.llvm.org/file/ can be used for storage of --reproduce cpio archives if they are too large for bugzilla.