warped_motion.c: delete unused filter_4tap[]

Change-Id: I139808f492a9e9dcac44a36237b61231ede7edc3

av1/common/warped_motion.c

diff --git a/av1/common/warped_motion.c b/av1/common/warped_motion.c
index 124c8f9..ad92150 100644
--- a/av1/common/warped_motion.c
+++ b/av1/common/warped_motion.c
@@ -139,31 +139,6 @@
   }
 }
 
-static const int16_t filter_4tap[WARPEDPIXEL_PREC_SHIFTS][4] = {
-  { 0, 128, 0, 0 },     { -1, 127, 2, 0 },    { -2, 127, 4, -1 },
-  { -3, 126, 6, -1 },   { -3, 125, 8, -2 },   { -4, 124, 11, -3 },
-  { -5, 123, 13, -3 },  { -5, 121, 15, -3 },  { -6, 120, 18, -4 },
-  { -7, 119, 20, -4 },  { -7, 118, 22, -5 },  { -8, 116, 25, -5 },
-  { -8, 115, 27, -6 },  { -9, 113, 30, -6 },  { -9, 112, 32, -7 },
-  { -9, 110, 34, -7 },  { -10, 108, 37, -7 }, { -10, 107, 39, -8 },
-  { -10, 105, 41, -8 }, { -11, 103, 44, -8 }, { -11, 101, 47, -9 },
-  { -11, 99, 49, -9 },  { -11, 97, 51, -9 },  { -11, 95, 54, -10 },
-  { -11, 93, 56, -10 }, { -12, 91, 59, -10 }, { -12, 89, 61, -10 },
-  { -12, 87, 64, -11 }, { -12, 85, 66, -11 }, { -12, 82, 69, -11 },
-  { -12, 80, 71, -11 }, { -12, 78, 73, -11 }, { -11, 75, 75, -11 },
-  { -11, 73, 78, -12 }, { -11, 71, 80, -12 }, { -11, 69, 82, -12 },
-  { -11, 66, 85, -12 }, { -11, 64, 87, -12 }, { -10, 61, 89, -12 },
-  { -10, 59, 91, -12 }, { -10, 56, 93, -11 }, { -10, 54, 95, -11 },
-  { -9, 51, 97, -11 },  { -9, 49, 99, -11 },  { -9, 47, 101, -11 },
-  { -8, 44, 103, -11 }, { -8, 41, 105, -10 }, { -8, 39, 107, -10 },
-  { -7, 37, 108, -10 }, { -7, 34, 110, -9 },  { -7, 32, 112, -9 },
-  { -6, 30, 113, -9 },  { -6, 27, 115, -8 },  { -5, 25, 116, -8 },
-  { -5, 22, 118, -7 },  { -4, 20, 119, -7 },  { -4, 18, 120, -6 },
-  { -3, 15, 121, -5 },  { -3, 13, 123, -5 },  { -3, 11, 124, -4 },
-  { -2, 8, 125, -3 },   { -1, 6, 126, -3 },   { -1, 4, 127, -2 },
-  { 0, 2, 127, -1 },
-};
-
 static const int16_t
     filter_ntap[WARPEDPIXEL_PREC_SHIFTS][WARPEDPIXEL_FILTER_TAPS] = {
       { 0, 0, 128, 0, 0, 0 },      { 0, -1, 128, 2, -1, 0 },