Add unit test for VP8 denoiser.

The unit test is to check the bitexactness of SSE2 code with C code.

Change-Id: I13cc08a557b02357e5d6c2db7a49e93ce0d8e16f
Refactoring of highbitdepth bitshift operations

Moves the high bitdepth bit-shift operations to tools_common.c

Change-Id: Ifab91574362609cd224d2d6bae5fde00652eb3e4
Merge "Add unit test for VP8 denoiser."
Merge "Refactoring of highbitdepth bitshift operations"