Retire concurrent recompilation delay for non-stress testing.

test/mjsunit/compiler/manual-concurrent-recompile.js

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 // Flags: --allow-natives-syntax --expose-gc
-// Flags: --concurrent-recompilation --concurrent-recompilation-delay=50
+// Flags: --concurrent-recompilation --block-concurrent-recompilation
 
 if (!%IsConcurrentRecompilationSupported()) {
   print("Concurrent recompilation is disabled. Skipping this test.");
   quit();
 }
 
 function f(x) {
   var xx = x * x;
   var xxstr = xx.toString();
   return xxstr.length;
 }
 
 function g(x) {
   var xxx = Math.sqrt(x) | 0;
   var xxxstr = xxx.toString();
   return xxxstr.length;
 }
 
 function k(x) {
   return x * x;
 }
 
 f(g(1));
 assertUnoptimized(f);
 assertUnoptimized(g);
 
 %OptimizeFunctionOnNextCall(f, "concurrent");
 %OptimizeFunctionOnNextCall(g, "concurrent");
-f(g(2));  // Trigger optimization.
+f(g(2));  // Kick off recompilation.
 
-assertUnoptimized(f, "no sync");  // Not yet optimized while background thread
-assertUnoptimized(g, "no sync");  // is running.
+assertUnoptimized(f, "no sync");  // Not yet optimized since recompilation
+assertUnoptimized(g, "no sync");  // is still blocked.
+
+// Let concurrent recompilation proceed.
+%UnblockConcurrentRecompilation();
 
 assertOptimized(f, "sync");  // Optimized once we sync with the
 assertOptimized(g, "sync");  // background thread.