Expand _01 half<->float limitation to _finite. Simplify.

src/core/SkSpanProcs.cpp

Index: src/core/SkSpanProcs.cpp
diff --git a/src/core/SkSpanProcs.cpp b/src/core/SkSpanProcs.cpp
index dddf7419e2f0eeb6efcf407f18931405a35e36e6..87dcbc0ee74d8aa6d975df82632f0cff6a6a816e 100644
--- a/src/core/SkSpanProcs.cpp
+++ b/src/core/SkSpanProcs.cpp
@@ -42,7 +42,7 @@ static void load_f16(const SkPixmap& src, int x, int y, SkPM4f span[], int count
     SkASSERT(src.addr64(x + count - 1, y));
 
     for (int i = 0; i < count; ++i) {
-        SkHalfToFloat_01(addr[i]).store(span[i].fVec);
+        SkHalfToFloat_finite(addr[i]).store(span[i].fVec);
     }
 }