Steps towards handling `new Element.div()`

pkg/compiler/lib/src/kernel/element_map_impl.dart

Index: pkg/compiler/lib/src/kernel/element_map_impl.dart
diff --git a/pkg/compiler/lib/src/kernel/element_map_impl.dart b/pkg/compiler/lib/src/kernel/element_map_impl.dart
index d588b91098ae974b09740743f4b4f0881faaa480..c7645069666de4d76de480097073ca86b5e2a1fc 100644
--- a/pkg/compiler/lib/src/kernel/element_map_impl.dart
+++ b/pkg/compiler/lib/src/kernel/element_map_impl.dart
@@ -158,7 +158,8 @@ class KernelToElementMapImpl extends KernelToElementMapMixin
   @override
   ConstantValue getFieldConstantValue(ir.Field field) {
     // TODO(johnniwinther): Cache the result in [_FieldData].
-    return getConstantValue(field.initializer, requireConstant: field.isConst);
+    return getConstantValue(field.initializer,
+        requireConstant: field.isConst, implicitNull: !field.isConst);
   }
 
   LibraryEntity lookupLibrary(Uri uri) {