Re-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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-// Flags: --track-fields --track-double-fields --allow-natives-syntax
-// Flags: --parallel-recompilation --parallel-recompilation-delay=100
+// Flags: --expose-debug-as debug --allow-natives-syntax
+// Flags: --parallel-recompilation-delay=300
 
 if (!%IsParallelRecompilationSupported()) {
   print("Parallel recompilation is disabled. Skipping this test.");
   quit();
 }
 
-function new_object() {
-  var o = {};
-  o.a = 1;
-  o.b = 2;
-  return o;
+Debug = debug.Debug
+
+function foo() {
+  var x = 1;
+  return x;
 }
 
-function add_field(obj) {
-  obj.c = 3;
+function bar() {
+  var x = 2;
+  return x;
 }
 
-add_field(new_object());
-add_field(new_object());
-%OptimizeFunctionOnNextCall(add_field, "parallel");
+foo();
+// Mark and trigger parallel optimization.
+%OptimizeFunctionOnNextCall(foo, "parallel");
+foo();
 
-var o = new_object();
-// Trigger optimization in the background thread.
-add_field(o);
-// Invalidate transition map while optimization is underway.
-o.c = 2.2;
-// Sync with background thread to conclude optimization that bailed out.
-assertUnoptimized(add_field, "sync");
+// 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();
+
+// Install optimized code when parallel optimization finishes.
+// This needs to be able to deal with shared code being a builtin.
+assertUnoptimized(foo, "sync");
+