Trace/BPT trap: 5

```
➜ v8-debug --allow-natives-syntax

➜ v81 v8-debug --allow-natives-syntax
V8 version 10.9.124
d8> const arr = [1,2,3]
undefined

➜ d8> %SystemBreak()
/Users/didi/.jsvu/v8-debug: line 2: 38695 Trace/BPT trap: 5 "/Users/didi/.jsvu/engines/v8-debug/v8-debug" --snapshot_blob="/Users/didi/.jsvu/engines/v8-debug/snapshot_blob.bin" "$@"
```

Reproduce the report with the v8-debug command and the d8 `%SystemBreak()` expression shown in the issue. Investigate the resulting `Trace/BPT trap: 5` on the reported setup; done means the cause is identified and the command no longer fails unexpectedly, with a regression check if the project provides one.

Written by the indexing model from the issue text.