Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

src/runtime.h

Index: src/runtime.h
diff --git a/src/runtime.h b/src/runtime.h
index 58062ca404935d802c4e8328ffedeed80491f976..bf1ba68b02a4af604f5f1782039cf61acdcd1cb7 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -84,7 +84,8 @@ namespace internal {
   F(LazyRecompile, 1, 1) \
   F(NotifyDeoptimized, 1, 1) \
   F(NotifyOSR, 0, 1) \
-  F(DeoptimizeFunction, 1, 1)             \
+  F(DeoptimizeFunction, 1, 1) \
+  F(OptimizeFunctionOnNextCall, 1, 1) \
   F(CompileForOnStackReplacement, 1, 1) \
   F(SetNewFunctionAttributes, 1, 1) \
   F(AllocateInNewSpace, 1, 1) \