[tests] Cleanup tests that use assertOptimized()/assertUnoptimized().

test/mjsunit/shared-function-tier-up-ignition.js

Index: test/mjsunit/shared-function-tier-up-ignition.js
diff --git a/test/mjsunit/shared-function-tier-up-ignition.js b/test/mjsunit/shared-function-tier-up-ignition.js
index 607c2e1e04b14352cfea23faeb50ba22813ba130..ffbf3a303fc490bbcacbcd66b879922f494d1836 100644
--- a/test/mjsunit/shared-function-tier-up-ignition.js
+++ b/test/mjsunit/shared-function-tier-up-ignition.js
@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
-// Flags: --mark-shared-functions-for-tier-up --allow-natives-syntax --ignition-staging --no-turbo
+// Flags: --mark-shared-functions-for-tier-up --allow-natives-syntax
+// Flags: --ignition-staging --no-turbo
+// Flags: --crankshaft --no-always-opt
 
 (function() {
   var sum = 0;