These handful of tests had a BOM (Byte order mark) at the beginning of
the file. This marker is unnecessary in our test files. The main
motivation for this is that the `ast` python module breaks when passing
a file to it with a BOM marker (and might break other tooling which
doesn't expect it). E.g.,:
```
"""Test that lldb command 'process signal SIGUSR1' to send a signal to the inferior works."""
^
SyntaxError: invalid non-printable character U+FEFF
```
If anyone is aware of a good reason to keep it, happy to drop this.
9c95617c79