Thalia Archibald a0c3dd4df4 Optimize io::Write::write_fmt for constant strings
When the formatting args to `fmt::Write::write_fmt` are a statically
known string, it simplifies to only calling `write_str` without a
runtime branch. Do the same in `io::Write::write_fmt` with `write_all`.

Also, match the convention of `fmt::Write` for the name of `args`.
2025-03-18 01:40:27 -07:00
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