[Pixman] MIPS ADD fast paths.

[Nemanja Lukic]

Added optimizations for several ADD fast paths:
     - add_8_8
     - add_8_8_8
     - add_n_8_8
     - add_n_8_8888
     - add_8888_8888
     - add_8888_8888_8888
     - add_0565_8_0565
     - add_8888_8_8888
     - add_8888_n_8888
Benchmark results (lowlevel-blt-bench) on Malta board (@1Ghz) are
included in the log messages.
Any comments to these patches are welcome.
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