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Auto merge of #100786 - sunshowers:macos-posix-chdir, r=sunshowers
Use posix_spawn for absolute paths on macOS Currently, on macOS, Rust never uses the fast posix_spawn path if a directory change is requested, due to a bug in Apple's libc. However, the bug is only triggered if the program is a relative path. This PR makes it so that the fast path continues to work if the program is an absolute path or a lone filename. This was an alternative proposed in rust-lang/rust#80537 (comment), and it makes a measurable performance difference in some of my code that spawns thousands of processes.
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