1. If there is a deleted element in FastModeArray, it should not skip updating its enumeration data

2. If setObjectPreComputedCase decides to make no more caches because of many cacheMisses, it should invalidate previous caches

Signed-off-by: Saebom Kim sae-bom.kim@samsung.com

src/runtime/ArrayObject.cpp

@@ -162,6 +162,7 @@ bool ArrayObject::deleteOwnProperty(ExecutionState& state, const ObjectPropertyN
             uint64_t len = getArrayLength(state);
             if (idx < len) {
                 m_fastModeData[idx] = Value(Value::EmptyValue);
+                ensureObjectRareData()->m_shouldUpdateEnumerateObjectData = true;
                 return true;
             }
         }