rename yuv matrix constants to be more clear about what they are

source/row_common.cc

Index: source/row_common.cc
diff --git a/source/row_common.cc b/source/row_common.cc
index c0cb3919d32f283643d8b923001ee82cb3a6a306..c2dda6568bda8eca84012d59916332cb62a3309a 100644
--- a/source/row_common.cc
+++ b/source/row_common.cc
@@ -1033,7 +1033,7 @@ void J400ToARGBRow_C(const uint8* src_y, uint8* dst_argb, int width) {
 #define BR            (VR * 128 + YGB)
 
 #if defined(__aarch64__)
-const YuvConstants SIMD_ALIGNED(kYuvIConstants) = {
+const YuvConstants SIMD_ALIGNED(kYuvI601Constants) = {
   { -UB, -VR, -UB, -VR, -UB, -VR, -UB, -VR },
   { -UB, -VR, -UB, -VR, -UB, -VR, -UB, -VR },
   { UG, VG, UG, VG, UG, VG, UG, VG },
@@ -1050,7 +1050,7 @@ const YuvConstants SIMD_ALIGNED(kYvuIConstants) = {
   { 0x0101 * YG, 0, 0, 0 }
 };
 #elif defined(__arm__)
-const YuvConstants SIMD_ALIGNED(kYuvIConstants) = {
+const YuvConstants SIMD_ALIGNED(kYuvI601Constants) = {
   { -UB, -UB, -UB, -UB, -VR, -VR, -VR, -VR, 0, 0, 0, 0, 0, 0, 0, 0 },
   { UG, UG, UG, UG, VG, VG, VG, VG, 0, 0, 0, 0, 0, 0, 0, 0 },
   { BB, BG, BR, 0, 0, 0, 0, 0 },
@@ -1063,7 +1063,7 @@ const YuvConstants SIMD_ALIGNED(kYvuIConstants) = {
   { 0x0101 * YG, 0, 0, 0 }
 };
 #else
-const YuvConstants SIMD_ALIGNED(kYuvIConstants) = {
+const YuvConstants SIMD_ALIGNED(kYuvI601Constants) = {
   { UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0,
     UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0 },
   { UG, VG, UG, VG, UG, VG, UG, VG, UG, VG, UG, VG, UG, VG, UG, VG,
@@ -1120,7 +1120,7 @@ const YuvConstants SIMD_ALIGNED(kYvuIConstants) = {
 #define BR            (VR * 128 + YGB)
 
 #if defined(__aarch64__)
-const YuvConstants SIMD_ALIGNED(kYuvJConstants) = {
+const YuvConstants SIMD_ALIGNED(kYuvJPEGConstants) = {
   { -UB, -VR, -UB, -VR, -UB, -VR, -UB, -VR },
   { -UB, -VR, -UB, -VR, -UB, -VR, -UB, -VR },
   { UG, VG, UG, VG, UG, VG, UG, VG },
@@ -1137,7 +1137,7 @@ const YuvConstants SIMD_ALIGNED(kYvuJConstants) = {
   { 0x0101 * YG, 0, 0, 0 }
 };
 #elif defined(__arm__)
-const YuvConstants SIMD_ALIGNED(kYuvJConstants) = {
+const YuvConstants SIMD_ALIGNED(kYuvJPEGConstants) = {
   { -UB, -UB, -UB, -UB, -VR, -VR, -VR, -VR, 0, 0, 0, 0, 0, 0, 0, 0 },
   { UG, UG, UG, UG, VG, VG, VG, VG, 0, 0, 0, 0, 0, 0, 0, 0 },
   { BB, BG, BR, 0, 0, 0, 0, 0 },
@@ -1150,7 +1150,7 @@ const YuvConstants SIMD_ALIGNED(kYvuJConstants) = {
   { 0x0101 * YG, 0, 0, 0 }
 };
 #else
-const YuvConstants SIMD_ALIGNED(kYuvJConstants) = {
+const YuvConstants SIMD_ALIGNED(kYuvJPEGConstants) = {
   { UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0,
     UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0 },
   { UG, VG, UG, VG, UG, VG, UG, VG, UG, VG, UG, VG, UG, VG, UG, VG,
@@ -1208,7 +1208,7 @@ const YuvConstants SIMD_ALIGNED(kYvuJConstants) = {
 #define BR            (VR * 128 + YGB)
 
 #if defined(__aarch64__)
-const YuvConstants SIMD_ALIGNED(kYuvHConstants) = {
+const YuvConstants SIMD_ALIGNED(kYuvH709Constants) = {
   { -UB, -VR, -UB, -VR, -UB, -VR, -UB, -VR },
   { -UB, -VR, -UB, -VR, -UB, -VR, -UB, -VR },
   { UG, VG, UG, VG, UG, VG, UG, VG },
@@ -1225,7 +1225,7 @@ const YuvConstants SIMD_ALIGNED(kYvuHConstants) = {
   { 0x0101 * YG, 0, 0, 0 }
 };
 #elif defined(__arm__)
-const YuvConstants SIMD_ALIGNED(kYuvHConstants) = {
+const YuvConstants SIMD_ALIGNED(kYuvH709Constants) = {
   { -UB, -UB, -UB, -UB, -VR, -VR, -VR, -VR, 0, 0, 0, 0, 0, 0, 0, 0 },
   { UG, UG, UG, UG, VG, VG, VG, VG, 0, 0, 0, 0, 0, 0, 0, 0 },
   { BB, BG, BR, 0, 0, 0, 0, 0 },
@@ -1238,7 +1238,7 @@ const YuvConstants SIMD_ALIGNED(kYvuHConstants) = {
   { 0x0101 * YG, 0, 0, 0 }
 };
 #else
-const YuvConstants SIMD_ALIGNED(kYuvHConstants) = {
+const YuvConstants SIMD_ALIGNED(kYuvH709Constants) = {
   { UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0,
     UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0, UB, 0 },
   { UG, VG, UG, VG, UG, VG, UG, VG, UG, VG, UG, VG, UG, VG, UG, VG,