[tests] Make assertOptimized()/assertUnoptimized() great again.

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

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 // Flags: --allow-natives-syntax --no-always-opt
 // Flags: --concurrent-recompilation --block-concurrent-recompilation
+// Flags: --no-always-opt
 
 if (!%IsConcurrentRecompilationSupported()) {
   print("Concurrent recompilation is disabled. Skipping this test.");
   quit();
 }
 
 function f(foo) { return foo.bar(); }
 
 var o = {};
 o.__proto__ = { __proto__: { bar: function() { return 1; } } };
 
 assertEquals(1, f(o));
 assertEquals(1, f(o));
 
 // Mark for concurrent optimization.
 %OptimizeFunctionOnNextCall(f, "concurrent");
 // Kick off recompilation.
 assertEquals(1, f(o));
 // Change the prototype chain after compile graph has been created.
 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);