Fix stride bug for msan on I420Interpolate.

When using C version of I420Interpolate for msan, a 50% interpolation
would cause stride to be cast to int, which could cause erroneous
memory reads on 64 bit build.
This CL makes the stride use ptrdiff_t for HalfRow_C

BUG=libyuv:582
TESTED=try bots tests
R=dhrosa@google.com

Review URL: https://codereview.chromium.org/1872953002 .

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1582
+Version: 1583
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1582
+#define LIBYUV_VERSION 1583
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/planar_functions.cc

@@ -1917,8 +1917,7 @@ int InterpolatePlane(const uint8* src0, int src_stride0,
 #endif
 
   for (y = 0; y < height; ++y) {
-    InterpolateRow(dst, src0, src1 - src0,
-                   width, interpolation);
+    InterpolateRow(dst, src0, src1 - src0, width, interpolation);
     src0 += src_stride0;
     src1 += src_stride1;
     dst += dst_stride;

source/row_common.cc

@@ -2147,7 +2147,7 @@ void ARGBAffineRow_C(const uint8* src_argb, int src_argb_stride,
 }
 
 // Blend 2 rows into 1.
-static void HalfRow_C(const uint8* src_uv, int src_uv_stride,
+static void HalfRow_C(const uint8* src_uv, ptrdiff_t src_uv_stride,
                       uint8* dst_uv, int width) {
   int x;
   for (x = 0; x < width; ++x) {
@@ -2155,7 +2155,7 @@ static void HalfRow_C(const uint8* src_uv, int src_uv_stride,
   }
 }
 
-static void HalfRow_16_C(const uint16* src_uv, int src_uv_stride,
+static void HalfRow_16_C(const uint16* src_uv, ptrdiff_t src_uv_stride,
                          uint16* dst_uv, int width) {
   int x;
   for (x = 0; x < width; ++x) {
@@ -2176,7 +2176,7 @@ void InterpolateRow_C(uint8* dst_ptr, const uint8* src_ptr,
     return;
   }
   if (y1_fraction == 128) {
-    HalfRow_C(src_ptr, (int)(src_stride), dst_ptr, width);
+    HalfRow_C(src_ptr, src_stride, dst_ptr, width);
     return;
   }
   for (x = 0; x < width - 1; x += 2) {
@@ -2206,7 +2206,7 @@ void InterpolateRow_16_C(uint16* dst_ptr, const uint16* src_ptr,
     return;
   }
   if (source_y_fraction == 128) {
-    HalfRow_16_C(src_ptr, (int)(src_stride), dst_ptr, width);
+    HalfRow_16_C(src_ptr, src_stride, dst_ptr, width);
     return;
   }
   for (x = 0; x < width - 1; x += 2) {