[cc65] A Few Good Optimizations

I have a few good optimizatios for code written in cc65 C:

*    Declaring an auto variable as static can save code.
*    Register declarations can save space in functions that don't call other functions.
*    If you need a certain calculation performed on the same piece of data several times, calculate it once and assign it to a variable.  If on several pieces of data at different times, write a function from that calculation and call it as needed.
*    If you need to call a function with the same parameters several times, create a wrapper function to supply the repeated parameters and call it with only the variant parameters.
*    If you need to reference a certain member of a struct or element of an array such that it takes extra calculations to access it, create a pointer to it or copy it to a static variable, a pointer if you need to modify it and a static variable if yoyu just need use the data.
*    If you use a function that will return the same value in your target and offers no other functionalite, try defining it as a const or using #define.
*    Using simpler functions usually saves code.

In exchange for these, I ask the following:

*    That these optimizations be placed in cc65's documentation,
*    That I be honored with these optimizations :), and
*    That others post their optimizations here.
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Joseph Rose, a.k.a. Harry Potter
Working magic in the computer community...or at least striving to!  :(

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