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d5312d53a0
Instead of checking for absolute paths and current working directories in various file system operations, there is one simple solution: allow overriding `std.fs.cwd` on WASI. os.realpath is back to causing a compile error when used on WASI. This caused a compile error in the Sema handling of `@src()`. The compiler should never call realpath, so the commit that made this change is reverted (95ab942184427e7c9b840d71f4d093931e3e48fb). If this breaks debug info, a different strategy is needed to solve it other than using realpath. I also removed the preopens code and replaced it with something much simpler. There is no longer any global state in the standard library. Additionally- * os.openat no longer does an unnecessary fstat on WASI when O.WRONLY is not provided. * os.chdir is back to causing a compile error on WASI.