Any way to compile with `-O2` or `-Ofast`?

[drkameleon]

Since, apparently the `-O3` option comes from `--opt:speed`, I've tried it 
again (and again) with this:
    
    
    -d: release --opt:none --passC:-O2 --passC:-fno-ident
    
    
    Run

And... I think I got it to work! (admittedly, not really suprised by the 
outcome; `-O3` seems to be a very decent choice, but still... I had to see for 
myself...)