Benchable and used modules

[AlexDaniel]

Sometimes a module is needed in the executed code:

• https://github.com/perl6/whateverable/blob/master/bin/Benchable.p6#L63 ⚠ (broken link)

And it goes a bit further and requires stuff like this:

• https://github.com/perl6/whateverable/blob/master/bin/Benchable.p6#L86 ⚠ (broken link)

Would be nice if we didn't have to do all this and the module was readily available by some other means.