Fix asan stacktrace entry parsing

[Avgor46]

ASAN: Rust panic in parse_stacktrace_entry (line) while parsing invalid entry:

      #4 0x998b40 in (anonymous namespace)::decrypt_xl<unsigned char> > const&) /xlnt/er+0x426cbd)

[SweetVishnya]

Add this example to tests, please

[SweetVishnya]

ASAN: Rust panic in parse_stacktrace_entry (line) while parsing invalid entry:

      #4 0x998b40 in (anonymous namespace)::decrypt_xl<unsigned char> > const&) /xlnt/er+0x426cbd)

The thing is that this entry is valid. We just cannot handle it ATM. We should change parsing code. Thus, we can correctly parse it.