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Raising an out-of-bounds panic is confusing. There's no indication
that the underlying problem is a race.

The runtime already does a pretty good job of detecting this kind of
race (modification while iterating). We might as well just reorganize
a bit to avoid the out-of-bounds panic.

Fixes #33275

Change-Id: Icdd337ad2eb3c84f999db0850ec1d2ff2c146b6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/191197

Reviewed-by: Martin Möhrmann <moehrmann@google.com>