test: lock in test for _ assignment evaluation/zerodivide panic

Fixes #5790.
Fixes #18421.

* Lock in _ = x1/x2 divide by zero runtime panics since
it is actually evaluated and not discarded as in previous
versions before Go1.8.
* Update a test that was skipping over zerodivide tests
that expected runtime panics, enabling us to check for
the expected panics.

Change-Id: I0af0a6ecc19345fa9763ab2e35b275fb2d9d0194
Reviewed-on: https://go-review.googlesource.com/34712
Reviewed-by: Keith Randall <khr@golang.org>
1 file changed
tree: 50a021888cd09fbeb8339c792ba728e46a4a1f98
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