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

test/mjsunit/compiler/concurrent-proto-change.js

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-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --no-always-opt
 // Flags: --concurrent-recompilation --block-concurrent-recompilation
 
 if (!%IsConcurrentRecompilationSupported()) {
   print("Concurrent recompilation is disabled. Skipping this test.");
   quit();
 }
 
 function f(foo) { return foo.bar(); }
 
 var o = {};
@@ skipping 10 matching lines @@
 o.__proto__.__proto__ = { bar: function() { return 2; } };
 // At this point, concurrent recompilation thread has not yet done its job.
 assertUnoptimized(f, "no sync");
 // Let the background thread proceed.
 %UnblockConcurrentRecompilation();
 // Optimization eventually bails out due to map dependency.
 assertUnoptimized(f, "sync");
 assertEquals(2, f(o));
 //Clear type info for stress runs.
 %ClearFunctionTypeFeedback(f);