Intel xf86 Graphics Driver for Linux

Fixes:
- Video clobbering composite batch state
- Incorrect reuse of surface bindings within a batch for multiple formats
- Nothing was rendered for text with procedural sources
- Handle fallbacks involving alpha maps
- Workaround blitter hang on SandyBridge and IvyBridge
- Workaround pipe control issues on SandyBridge
- Use correct maximum PS thread count on IvyBridge
- Protect against failed pixmap allocation for XV

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