Fix equality invocation on native objects

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
index f7fa49105fab10aad80afb94d475187a898db39b..aeae578522840f35ce0c2e26a118495ab2ac76dd 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
@@ -622,11 +622,13 @@ addTypeTests(ctor) => JS(
   };
 })()''');
 
+// TODO(vsm): Consider optimizing this.  We may be able to statically
+// determine which == operation to invoke given the static types.
 equals(x, y) => JS(
     '',
     '''(() => {
   if ($x == null || $y == null) return $x == $y;
-  let eq = $x['=='];
+  let eq = $x[dartx['==']] || $x['=='];
   return eq ? eq.call($x, $y) : $x === $y;
 })()''');