Report a safari-specific test failure without halting all tests #485
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As mentioned in #479, there's a safari-specific half float bug that brings tests to a halt. Rather than a new failure, I believe this is instead the result of a new check for behavior that does seem broken in safari: 75730b6#diff-6d2e0d9813eb0b2330521d6a391021d3R169
This PR doesn't fix anything (Babylon, for one, just detects safari and reverts from half_float to float, I believe) but instead triggers a test failure that doesn't halt all tests.
In particular, it just wraps the test in a try/catch and reports a failure if it catches anything.