Abort optimization when debugger is turned on.

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

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-// Flags: --fold-constants --nodead-code-elimination
-// Flags: --expose-gc --allow-natives-syntax
+// Flags: --expose-debug-as debug --allow-natives-syntax
 // Flags: --parallel-recompilation --parallel-recompilation-delay=300
 
 if (!%IsParallelRecompilationSupported()) {
   print("Parallel recompilation is disabled. Skipping this test.");
   quit();
 }
 
-function assertUnoptimized(fun) {
-  assertTrue(%GetOptimizationStatus(fun) != 1);
+Debug = debug.Debug;
+
+function listener(event, exec_state, event_data, data) {
+  if (event != Debug.DebugEvent.Break) return;
+  try {
+    assertEquals("foo", exec_state.frame(0).evaluate("a").value());
+  } catch (e) {
+    exception = e;
+  };
+  listened++;
+};
+
+var exception = null;
+var listened = 0;
+
+var f = function() {
+  var a = "foo";
+  var b = a.substring("1");
+  [a, b].sort();
+  return a;
 }
 
-function test(fun) {
-  fun();
-  fun();
-  %OptimizeFunctionOnNextCall(fun, "parallel");
-  fun();  // Trigger optimization in the background.
-  gc();   // Tenure cons string.
-  assertUnoptimized(fun);      // Compilation not complete yet.
-  %CompleteOptimization(fun);  // Compilation embeds tenured cons string.
-  gc();   // Visit embedded cons string during mark compact.
-}
+f();
+f();
+%OptimizeFunctionOnNextCall(f, "parallel");  // Mark with builtin.
+f();                           // Kick off parallel recompilation.
 
-function f() {
-  return "abcdefghijklmn" + "123456789";
-}
+Debug.setListener(listener);   // Activate debugger.
+Debug.setBreakPoint(f, 2, 0);  // Force deopt.
+%CompleteOptimization(f);      // Install optimized code.
 
-function g() {
-  return "abcdefghijklmn\u2603" + "123456789";
-}
-
-function h() {
-  return "abcdefghijklmn\u2603" + "123456789\u2604";
-}
-
-test(f);
-test(g);
-test(h);
+f();                           // Trigger break point.
+assertEquals(1, listened);
+assertNull(exception);