remove static initializers for partition tree

Could have problem with 2 encoders.

Change-Id: I92d326933c00fee688f77b54acf467ca5a8516bc
see: https://code.google.com/p/webm/issues/detail?id=900&thanks=900&ts=1418843841
Revert "Revert "Removal of legacy zbin_extra / zbin_oq_value.""

This reverts commit 9946ee23e0a4c158e26a505b162a072f81b8a3be.

Fix the ssse3 asm function.

Change-Id: I07f77a63aa98087626e45c4e87aa5dcafc0b0b07
make vp9_coef_encodings const

Change-Id: I28a3d342a4a4b23e02a0f47bb8037c4403f71d61
Merge "Revert "Revert "Removal of legacy zbin_extra / zbin_oq_value."""
Merge "remove static initializers for partition tree"
Merge "make vp9_coef_encodings const"