Re-optimize faster after making a pretenuring decision.

test/cctest/test-deoptimization.cc

Index: test/cctest/test-deoptimization.cc
diff --git a/test/cctest/test-deoptimization.cc b/test/cctest/test-deoptimization.cc
index dbbb3edb097d4fc7fc202b93c51611993778e926..05728a58b7e8ec022718085aea8facd358018883 100644
--- a/test/cctest/test-deoptimization.cc
+++ b/test/cctest/test-deoptimization.cc
@@ -695,3 +695,27 @@ TEST(DeoptimizeLoadICStoreICNested) {
   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());
+}