Jingning Han 0ede9f52b7 Unify subtract function used in VP8/9
This commit replaces the vp8_ prefixed subtract function with the
common vpx_subtract_block function. It removes redundant SIMD
optimization codes and unit tests.

Change-Id: I42e086c32c93c6125e452dcaa6ed04337fe028d9
2015-07-07 09:57:44 -07:00
..
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