[cc65] Using the hardware stack

I implemented another enhancement to cc65, an option
to use the hardware stack for saving/restoring
'register' (zero page) variables (for non-leaf
functions; leaf functions can avoid the save/restore
altogether). This is much faster and often smaller
than using the C stack. Since the default maximum
usage is only 6 bytes per function, this is unlikely
to cause stack overflow issues.

Coupled with static parameter passing and leaf
function optimization, the function call overhead is
greatly reduced.

Dan



       
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