Skip op-numeric-unary-minus-1 testcase because it crashes.

It seems to require a larger refactoring in order to solve this, so
we skip this for now in order for us to be able to run the remaining
tests in CI.

Change-Id: I2ae4860a92cdb7fb88ca89c4dd1f047bacbaaf9e
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>