Flush denorm half floats to zero.

src/effects/gradients/Sk4fGradientPriv.h

Index: src/effects/gradients/Sk4fGradientPriv.h
diff --git a/src/effects/gradients/Sk4fGradientPriv.h b/src/effects/gradients/Sk4fGradientPriv.h
index 6542683eb0a47cdf8cada494a7adc98e5f94f268..c4e2d578e8b692f33ceca0c9229d619012d552b7 100644
--- a/src/effects/gradients/Sk4fGradientPriv.h
+++ b/src/effects/gradients/Sk4fGradientPriv.h
@@ -141,12 +141,12 @@ struct DstTraits<DstType::F16, premul> {
     }
 
     static void store(const Sk4f& c, Type* dst) {
-        SkFloatToHalf_finite(PM::apply(c)).store(dst);
+        SkFloatToHalf_ordinary(PM::apply(c)).store(dst);
     }
 
     static void store(const Sk4f& c, Type* dst, int n) {
         uint64_t color;
-        SkFloatToHalf_finite(PM::apply(c)).store(&color);
+        SkFloatToHalf_ordinary(PM::apply(c)).store(&color);
         sk_memset64(dst, color, n);
     }