Re-optimize faster after making a pretenuring decision.

test/cctest/test-deoptimization.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 677 matching lines @@
   }
   NonIncrementalGC();
 
   CHECK(!GetJSFunction(env->Global(), "f1")->IsOptimized());
   CHECK(!GetJSFunction(env->Global(), "g1")->IsOptimized());
   CHECK(!GetJSFunction(env->Global(), "f2")->IsOptimized());
   CHECK(!GetJSFunction(env->Global(), "g2")->IsOptimized());
   CHECK_EQ(1, env->Global()->Get(v8_str("count"))->Int32Value());
   CHECK_EQ(13, env->Global()->Get(v8_str("result"))->Int32Value());
 }
+
+
+TEST(ReoptimizeInstantly) {
+  i::FLAG_allow_natives_syntax = true;
+  i::FLAG_concurrent_recompilation = false;
+  if (!CcTest::i_isolate()->use_crankshaft()) return;
+  LocalContext env;
+  v8::HandleScope scope(env->GetIsolate());
+
+  CompileRun(
+      "function f(x) {"
+      "  return x;"
+      "};"
+      "f(0); f(0); f(0);"
+      "%OptimizeFunctionOnNextCall(f);"
+      "f(0);");
+  Handle<JSFunction> function = GetJSFunction(env->Global(), "f");
+  CHECK(function->IsOptimized());
+  function->code()->set_marked_for_instant_optimization(true);
+  CompileRun("%DeoptimizeFunction(f);");
+  CHECK(!function->IsOptimized());
+  CompileRun("f(0);");
+  CHECK(function->IsOptimized());
+}