[WINED3D] Support more than 6 temporary registers

[Ivan Gyurdiev]

Pixel Shaders 2.0+ support more than 6 temporaries, but we hardcode them 
to 6. This patch borrows code from the Vertex Shader "first pass", and 
uses it to track how many temporary and texture registers are used. 
Declarations are only emitted for used registers, unlike before. 
Additionally, up to numTemps temporary registers are now supported 
(determined by the shader version).

Future use might be to also track constants, and address registers [ if 
merged with vertex first pass ].
Note that I use a DWORD bitmap to track usage, but that seems ok [ at 
least for now ], since no more than 32 registers are allowed.
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