Reland "Flush parallel recompilation queues on context dispose notification."

test/mjsunit/regress/regress-prepare-break-while-recompile.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 //
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 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --expose-debug-as debug --allow-natives-syntax
+// Flags: --parallel-recompilation-delay=300
 
-Debug = debug.Debug;
-var listened = false;
+Debug = debug.Debug
 
-function listener(event, exec_state, event_data, data) {
-  if (event == Debug.DebugEvent.Exception) {
-    for (var i = 0; i < exec_state.frameCount(); i++) {
-      print(exec_state.frame(i).receiver());
-      print(exec_state.frame(i).func().name());
-    }
-  }
-  listened = true;
+function foo() {
+  var x = 1;
+  return x;
 }
 
-Debug.setListener(listener);
-Debug.setBreakOnException();
+function bar() {
+  var x = 2;
+  return x;
+}
 
-assertThrows(function() { delete null['foo']; });
+foo();
+// Mark and trigger parallel optimization.
+%OptimizeFunctionOnNextCall(foo, "parallel");
+foo();
 
-Debug.clearBreakOnException();
-Debug.setListener(null);
+// Set break points on an unrelated function. This clears both optimized
+// and (shared) unoptimized code on foo, and sets both to lazy-compile builtin.
+// Clear the break point immediately after to deactivate the debugger.
+Debug.setBreakPoint(bar, 0, 0);
+Debug.clearAllBreakPoints();
 
-assertTrue(listened);
+// Install optimized code when parallel optimization finishes.
+// This needs to be able to deal with shared code being a builtin.
+assertUnoptimized(foo, "sync");