MODE_INFO size reduction

Declared the bmi in MODE_INFO as a union instead of B_MODE_INFO.
This reduced the memory footprint by 518,400 bytes for 1080
resolutions.  The decoder performance improved by ~4% for the
clip used and the encoder showed very small improvements. (0.5%)
This reduction was first mentioned to me by John K. and in a
later discussion by Yaowu.
This is WIP.

Change-Id: I8e175fdbc46d28c35277302a04bee4540efc8d29

vp8/encoder/encodeintra.c

@@ -88,7 +88,6 @@ void vp8_encode_intra16x16mby(const VP8_ENCODER_RTCD *rtcd, MACROBLOCK *x)
 
         switch (x->e_mbd.mode_info_context->mbmi.mode)
         {
-
         case DC_PRED:
             d->bmi.mode = B_DC_PRED;
             break;
@@ -104,7 +103,6 @@ void vp8_encode_intra16x16mby(const VP8_ENCODER_RTCD *rtcd, MACROBLOCK *x)
         default:
             d->bmi.mode = B_DC_PRED;
             break;
-
         }
     }
 }