Turn on parallel recompilation for tests that assert optimization status.

test/mjsunit/regress/regress-opt-after-debug-deopt.js

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 // Flags: --expose-debug-as debug --allow-natives-syntax
-// Flags: --parallel-recompilation --parallel-recompilation-delay=300
+// Flags: --parallel-recompilation --parallel-recompilation-delay=100
 
 if (!%IsParallelRecompilationSupported()) {
   print("Parallel recompilation is disabled. Skipping this test.");
   quit();
 }
 
 Debug = debug.Debug;
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
@@ skipping 15 matching lines @@
   return a;
 }
 
 f();
 f();
 %OptimizeFunctionOnNextCall(f, "parallel");  // Mark with builtin.
 f();                           // Kick off parallel recompilation.
 
 Debug.setListener(listener);   // Activate debugger.
 Debug.setBreakPoint(f, 2, 0);  // Force deopt.
-%CompleteOptimization(f);      // Install optimized code.
+// Sync with parallel optimization thread.  But no optimized code is installed.
+assertUnoptimized(f, "sync");
 
 f();                           // Trigger break point.
 assertEquals(1, listened);
 assertNull(exception);