Merge "optimize decode_bool operation"

vp9/decoder/vp9_dboolhuff.h

diff --git a/vp9/decoder/vp9_dboolhuff.h b/vp9/decoder/vp9_dboolhuff.h
index c864516..fd8e74c 100644
--- a/vp9/decoder/vp9_dboolhuff.h
+++ b/vp9/decoder/vp9_dboolhuff.h
@@ -44,7 +44,7 @@
   VP9_BD_VALUE bigsplit;
   int count;
   unsigned int range;
-  unsigned int split = 1 + (((br->range - 1) * probability) >> 8);
+  unsigned int split = ((br->range * probability) + (256 - probability)) >> 8;
 
   if (br->count < 0)
     vp9_reader_fill(br);