Function speedup sse2 v. C
Predictor  V_PRED  H_PRED
4x8        ~1.7x   ~1.8x
8x4        ~1.8x   ~2.2x
8x16       ~1.5x   ~1.4x
16x8       ~1.9x   ~1.3x
16x32      ~1.6x   ~1.4x
32x16      ~2.0x   ~1.9x

This patch disables speed tests to save Jenkins build
time. Developer can manually enable them by using,
--gtest_also_run_disabled_test flag in test command line.

Change-Id: I81eaee5e8afc55275c7507c99774f78cc9e49f9a