Jingning Han d642294b1c Fix tsan error in VP9 sub8x8 intra mode search
This commit fixes issue 1141. The issue was triggered in multi-tile
encoding. The change properly saves and restores the block context
information in the real-time mode selection process. It removes
several redundant memcpy operations in sub8x8 intra block mode search.

Change-Id: I35c9ad197f4bd500ec39b5fc833f052f19eee010
2016-02-16 11:24:09 -08:00
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