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Otherwise we lose the side effect of a `NegativeArraySizeException`.
A test for this case already exists (run/t8601b.scala), but it currently
enforces `-optimize -Ybackend:GenASM`, so it didn't trigger on the new
backend. However, PR #4814 was merged into 2.12.x and moved that test
over to the new backend and optimizer. After merging the 2.12.x into
the current optimizer branch (push-pop elimination), the test started
failing.
Also disable the optimizer for `jvm/bytecode-test-example`: it counts
the number of null checks in a method, the optimizer (rightly) eliminates
one of the two.
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