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slight adjustment to coef band definition

This commit adjusted slightly the 4x4 coefficents band definition to
better classify coefficients with similar distributions and usages.
It helps derf set about .1%, it is alos slightly positive for std-hd
set, where 4x4 blocks are used less frequently.

The commit also removed a const array not in use.

Change-Id: I78d16905d4036641ec905b0c32c190c1def5b249

--- a/vp8/common/entropy.c

+++ b/vp8/common/entropy.c

@@ -48,7 +48,7 @@

 };

 DECLARE_ALIGNED(16, cuchar, vp8_coef_bands[16]) =

-{ 0, 1, 2, 3, 6, 4, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7};

+{ 0, 1, 2, 3, 6, 4, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7};

 DECLARE_ALIGNED(16, cuchar, vp8_prev_token_class[MAX_ENTROPY_TOKENS]) =

 { 0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0};

@@ -77,13 +77,6 @@

     58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63,

 };

-DECLARE_ALIGNED(16, const short, vp8_default_inv_zig_zag[16]) =

-{

-    1,  2,  6,  7,

-    3,  5,  8, 13,

-    4,  9, 12, 14,

-   10, 11, 15, 16

-};

 DECLARE_ALIGNED(16, short, vp8_default_zig_zag_mask[16]);

 DECLARE_ALIGNED(64, short, vp8_default_zig_zag_mask_8x8[64]);//int64_t

--- a/vp8/common/entropy.h

+++ b/vp8/common/entropy.h

@@ -96,7 +96,6 @@

 struct VP8Common;

 void vp8_default_coef_probs(struct VP8Common *);

 extern DECLARE_ALIGNED(16, const int, vp8_default_zig_zag1d[16]);

-extern DECLARE_ALIGNED(16, const short, vp8_default_inv_zig_zag[16]);

 extern short vp8_default_zig_zag_mask[16];

 extern DECLARE_ALIGNED(64, const int, vp8_default_zig_zag1d_8x8[64]);

 extern short vp8_default_zig_zag_mask_8x8[64];//int64_t

-- 

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