Revert "skip un-neccessary motion search in the first pass"

This patch appears to have introduced non-determinism and/or
mismatch from debug vs release.

This reverts commit 5daef90efc4613efd7e7ee80ba4e1ecf9a57a966.

Change-Id: I80081e55cfeaaa821b510b58a4e6e6328003c7da