util/deephash: don't track cycles on non-recursive types

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name              old time/op    new time/op    delta
Hash-8              67.3µs ±20%    76.5µs ±16%     ~     (p=0.143 n=10+10)
HashMapAcyclic-8    63.0µs ± 2%    56.3µs ± 1%  -10.65%  (p=0.000 n=10+8)
TailcfgNode-8       9.18µs ± 2%    6.52µs ± 3%  -28.96%  (p=0.000 n=9+10)
HashArray-8          732ns ± 3%     709ns ± 1%   -3.21%  (p=0.000 n=10+10)

name              old alloc/op   new alloc/op   delta
Hash-8               24.0B ± 0%     24.0B ± 0%     ~     (all equal)
HashMapAcyclic-8     0.00B          0.00B          ~     (all equal)
TailcfgNode-8        0.00B          0.00B          ~     (all equal)
HashArray-8          0.00B          0.00B          ~     (all equal)

name              old allocs/op  new allocs/op  delta
Hash-8                1.00 ± 0%      1.00 ± 0%     ~     (all equal)
HashMapAcyclic-8      0.00           0.00          ~     (all equal)
TailcfgNode-8         0.00           0.00          ~     (all equal)
HashArray-8           0.00           0.00          ~     (all equal)

Change-Id: I28642050d837dff66b2db54b2b0e6d272a930be8
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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