A couple of asan tests have started failing since the musl upgrade (#13006)

See: https://logs.chromium.org/logs/emscripten-releases/buildbucket/cr-buildbucket/8830839149448959873/+/steps/Emscripten_testsuite__AddressSanitizer_/0/stdout

Looks like two are failing:

```
FAIL: test_float_builtins (test_core.asan)
FAIL: test_emmalloc_memalign_corruption (test_core.asan)
```