* In a first pass we create as much copy instructions as possible as they
* are generally cheaper than exchanges. We do this by counting into how many
* destinations a register has to be copied (in the example it's 2 for register
* In a first pass we create as much copy instructions as possible as they
* are generally cheaper than exchanges. We do this by counting into how many
* destinations a register has to be copied (in the example it's 2 for register