SkNx Load/store: take any pointer.

src/opts/SkXfermode_opts.h

Index: src/opts/SkXfermode_opts.h
diff --git a/src/opts/SkXfermode_opts.h b/src/opts/SkXfermode_opts.h
index 7b72bc3f80145706ad15356cd6446c47ab53b2da..f15094c98bfa5fff4cfc12c0109324252cbc8b36 100644
--- a/src/opts/SkXfermode_opts.h
+++ b/src/opts/SkXfermode_opts.h
@@ -285,12 +285,12 @@ private:
     }
 
     static Sk4f Load(SkPMColor c) {
-        return SkNx_cast<float>(Sk4b::Load((uint8_t*)&c)) * Sk4f(1.0f/255);
+        return SkNx_cast<float>(Sk4b::Load(&c)) * Sk4f(1.0f/255);
     }
 
     static SkPMColor Round(const Sk4f& f) {
         SkPMColor c;
-        SkNx_cast<uint8_t>(f * Sk4f(255) + Sk4f(0.5f)).store((uint8_t*)&c);
+        SkNx_cast<uint8_t>(f * Sk4f(255) + Sk4f(0.5f)).store(&c);
         return c;
     }