Avoid panic_bounds_check in fmt::write.

Writing any fmt::Arguments would trigger the inclusion of usize
formatting and padding code in the resulting binary, because indexing
used in fmt::write would generate code using panic_bounds_check, which
prints the index and length.

These bounds checks are not necessary, as fmt::Arguments never contains
any out-of-bounds indexes.

This change replaces them with unsafe get_unchecked, to reduce the
amount of generated code, which is especially important for embedded
targets.

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