Port pass tests that use safe heap + threads to lit (#8184)

For #8169. Part of #8165. Remaining tests are ported in #8185.

```sh
python3 scripts/port_passes_tests_to_lit.py test/passes/safe-heap_enable-threads_enable-simd.wast test/passes/safe-heap_enable-threads_enable-simd64.wast test/passes/safe-heap_low-memory-unused_enable-threads_enable-simd.wast
```

Author: stevenfontanella