wasi: manually adds dot and dot-dot directory entries #1152
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This manually adds dot and dot-dot directory entries discarded by compilers like Go. Doing so complies with the latest interpretation of wasi preview1 without forcing us to do the same in preview2 or in GOOS=js. There's a cost penalty of one stat per directory list, which will be only measurable when using real file I/O.
This should result in us being able to remove the exclusion here https://github.com/WebAssembly/wasi-testsuite/pull/55/files#diff-8a3ffd323d75a12f8deb01b053f062876d83dda0b89c1fa24b293cee4195bcfd
See WebAssembly/wasi-testsuite#52