Add rounding to InterpolateRow for improved quality and consistency.

source/scale_common.cc

Index: source/scale_common.cc
diff --git a/source/scale_common.cc b/source/scale_common.cc
index 1711f3d54c129ede8af25fd03735d8a16cea7bd7..f5c908d0bf5b4d41d2d44b34d29e65a9ed859b61 100644
--- a/source/scale_common.cc
+++ b/source/scale_common.cc
@@ -876,14 +876,6 @@ void ScalePlaneVertical(int src_height,
   assert(dst_width > 0);
   assert(dst_height > 0);
   src_argb += (x >> 16) * bpp;
-#if defined(HAS_INTERPOLATEROW_SSE2)
-  if (TestCpuFlag(kCpuHasSSE2)) {
-    InterpolateRow = InterpolateRow_Any_SSE2;
-    if (IS_ALIGNED(dst_width_bytes, 16)) {
-      InterpolateRow = InterpolateRow_SSE2;
-    }
-  }
-#endif
 #if defined(HAS_INTERPOLATEROW_SSSE3)
   if (TestCpuFlag(kCpuHasSSSE3)) {
     InterpolateRow = InterpolateRow_Any_SSSE3;