internal/deepprint: special-case some common types

These show up a lot in our data structures.

name    old time/op    new time/op    delta
Hash-8    11.5µs ± 1%     7.8µs ± 1%  -32.17%  (p=0.000 n=10+10)

name    old alloc/op   new alloc/op   delta
Hash-8    1.98kB ± 0%    1.67kB ± 0%  -15.73%  (p=0.000 n=10+10)

name    old allocs/op  new allocs/op  delta
Hash-8      82.0 ± 0%      53.0 ± 0%  -35.37%  (p=0.000 n=10+10)

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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