[maglev] Disable Maglev for the default ctor omitting test

Maglev support is not implemented yet.

Also make Maglev conflict with --no-maglev.

Bug: v8:13091,v8:13253
Change-Id: Iac5f06a5697405348f681b29ec43044abf50d90a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3907725
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Marja Hölttä <marja@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83327}

test/mjsunit/omit-default-ctors-array-iterator.js

@@ -2,9 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --omit-default-ctors --no-turbofan --no-always-turbofan
+// Flags: --omit-default-ctors --no-turbofan --no-always-turbofan --no-maglev
 
 // TODO(v8:13091): Enable TurboFan.
+// TODO(v8:13091): Enable Maglev.
 
 // This behavior is not spec compliant, see crbug.com/v8/13249.
 (function ArrayIteratorMonkeyPatched() {

test/mjsunit/omit-default-ctors.js

@@ -2,9 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --omit-default-ctors --no-turbofan --no-always-turbofan
+// Flags: --omit-default-ctors --no-turbofan --no-always-turbofan --no-maglev
 
 // TODO(v8:13091): Enable TurboFan.
+// TODO(v8:13091): Enable Maglev.
 
 (function OmitDefaultBaseCtor() {
   class A {}  // default base ctor -> will be omitted

tools/testrunner/local/variants.py

@@ -80,7 +80,7 @@ INCOMPATIBLE_FLAGS_PER_VARIANT = {
     ],
     "sparkplug": ["--jitless", "--no-sparkplug"],
     "concurrent_sparkplug": ["--jitless"],
-    "maglev": ["--jitless"],
+    "maglev": ["--jitless", "--no-maglev"],
     "stress_maglev": ["--jitless"],
     "always_sparkplug": ["--jitless", "--no-sparkplug"],
     "code_serializer": [