Prevent deopt when assigning double values to typed arrays

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 6ce4c44177e61c40a99d40ec5287cb72feea6656..fecf4ce8c881423d2db22e907a9959d0fede8e37 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -9102,32 +9102,7 @@ MaybeObject* JSObject::PrepareElementsForSort(uint32_t limit) {
 Object* ExternalPixelArray::SetValue(uint32_t index, Object* value) {
   uint8_t clamped_value = 0;
   if (index < static_cast<uint32_t>(length())) {
-    if (value->IsSmi()) {
-      int int_value = Smi::cast(value)->value();
-      if (int_value < 0) {
-        clamped_value = 0;
-      } else if (int_value > 255) {
-        clamped_value = 255;
-      } else {
-        clamped_value = static_cast<uint8_t>(int_value);
-      }
-    } else if (value->IsHeapNumber()) {
-      double double_value = HeapNumber::cast(value)->value();
-      if (!(double_value > 0)) {
-        // NaN and less than zero clamp to zero.
-        clamped_value = 0;
-      } else if (double_value > 255) {
-        // Greater than 255 clamp to 255.
-        clamped_value = 255;
-      } else {
-        // Other doubles are rounded to the nearest integer.
-        clamped_value = static_cast<uint8_t>(double_value + 0.5);
-      }
-    } else {
-      // Clamp undefined to zero (default). All other types have been
-      // converted to a number type further up in the call chain.
-      ASSERT(value->IsUndefined());
-    }
+    clamped_value = NumberToClampedUInt8(value);
     set(index, clamped_value);
   }
   return Smi::FromInt(clamped_value);