bug#25351: Patch for bug#25351: 26.0.50; Testcover doesn't work on code that creates simple lists and modifies them

[Gemini Lasswell]

Here is a patch which fixes this bug by making a copy of the result of
the first evaluation of a form to compare with the results of
subsequent evaluations.

This patch is based on the two patches I sent yesterday to bug#25316.

Because Testcover may encounter circular structures in the code it
instruments, I wrote a modified version of copy-tree which can handle
circular structures. It's possibly generally useful enough to belong
in subr.el alongside copy-tree instead of being an internal Testcover
function, but I will submit that idea as a separate wishlist item.

There isn't currently a version of `equal' which works for circular
structures, so Testcover's handling of them is not fully implemented,
but it now avoids stopping the code under coverage with an error
message.

0001-Stop-Testcover-from-producing-spurious-1value-errors.patch
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