Retire concurrent recompilation delay for non-stress testing.

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

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 // Flags: --expose-debug-as debug --allow-natives-syntax
-// Flags: --concurrent-recompilation --concurrent-recompilation-delay=100
+// Flags: --concurrent-recompilation --block-concurrent-recompilation
 
 if (!%IsConcurrentRecompilationSupported()) {
   print("Concurrent 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 13 matching lines @@
   var b = a.substring("1");
   [a, b].sort();
   return a;
 }
 
 f();
 f();
 %OptimizeFunctionOnNextCall(f, "concurrent");  // Mark with builtin.
 f();                           // Kick off concurrent recompilation.
 
+// After compile graph has been created...
 Debug.setListener(listener);   // Activate debugger.
 Debug.setBreakPoint(f, 2, 0);  // Force deopt.
+
+// At this point, concurrent recompilation is still being blocked.
+assertUnoptimized(f, "no sync");
+// Let concurrent recompilation proceed.
+%UnblockConcurrentRecompilation();
 // Sync with optimization thread.  But no optimized code is installed.
 assertUnoptimized(f, "sync");
 
 f();                           // Trigger break point.
 assertEquals(1, listened);
 assertNull(exception);