[regexp] Ensure regress-1255368 runs only with irregexp

The expected assertion is specific to irregexp codegen.

Bug: chromium:1255368
Change-Id: I14d033285014727de2e63582ed798fc82570497d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3207892
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77254}

test/mjsunit/regress/regress-1255368.js

@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --no-regexp-tier-up
+// Flags: --no-regexp-tier-up --no-enable-experimental-regexp-engine
+// Flags: --no-regexp-interpret-all
 
 const arr = new Array(20000).fill([1]);
 const regexp = RegExp(JSON.stringify(arr));

tools/testrunner/local/variants.py

@@ -54,7 +54,7 @@ ALL_VARIANT_FLAGS = {
 INCOMPATIBLE_FLAGS_PER_VARIANT = {
   "jitless": ["--opt", "--always-opt", "--liftoff", "--track-field-types",
               "--validate-asm", "--sparkplug", "--always-sparkplug",
-              "--regexp-tier-up"],
+              "--regexp-tier-up", "--no-regexp-interpret-all"],
   "nooptimization": ["--always-opt"],
   "slow_path": ["--no-force-slow-path"],
   "stress_concurrent_allocation": ["--single-threaded-gc", "--predictable"],