[Test] Prevent --deopt-every-n-times for test.

BUG=v8:11056

Change-Id: I044a9f5dc0a37df6076eb1f3f36e3d71ec7b7915
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2498692
Auto-Submit: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70759}

test/mjsunit/compiler/test-dynamic-map-check-deprecated-maps2.js

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --turboprop --turboprop-dynamic-map-checks --opt
-// Flags: --no-always-opt
+// Flags: --allow-natives-syntax --turboprop --turboprop-dynamic-map-checks
+// Flags: --opt --no-always-opt --deopt-every-n-times=0
 
 function b(a) { return a; }