[test] Don't flush code for another flaky optimization test

Bug: v8:12350
Change-Id: Ic4c8f11df4f0916d3fcb4b9d60b6e06bab4f3df8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3252820
Auto-Submit: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77641}

test/mjsunit/regress/regress-9441.js

@@ -4,6 +4,10 @@
 
 // Flags: --allow-natives-syntax --opt --no-always-opt
 
+// This test does not work well if we flush the feedback vector, which causes
+// deoptimization.
+// Flags: --no-stress-flush-code --no-flush-bytecode
+
 function foo(a, b) {
     return a - b;
 }