[cc65] Global zero page pointers

I implemented an enhancement to optimize global zero
page pointers (marked with #pragma zpsym), i.e. treat
them like 'register' variables, meaning that they are
used directly rather than being copied into a temp
zero page pointer.

Ullrich, can you confirm this is safe? It would only
be a problem if stores to regbank without subsequent
loads were optimized away. But as far as I can tell,
there is no such optimization.

Dan



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