[1/3] WineD3D: Separate Tx tempregs from Tx varyings in ARB

[Stefan Dösinger]

The advantages of this:

*) We don't need up to 8 private temporaries in ps_2_0
*) We save the copy into the private temp(the ARB assemblers generally do not 
optimize)

For GLSL we need a similar patch to get rid of some (correct) ATI warnings. 
I've put it in the backend and not the frontend because a hypothetical nvts 
shader backend would be confused by this.
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