Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index f2b5665c16c1c73b9016e627fdb39e2f06223724..2510be829320eca77a1aeb35d0d1a3bd54b2212a 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4523,6 +4523,9 @@ class JSFunction: public JSObject {
   // Tells whether or not this function has been optimized.
   inline bool IsOptimized();
 
+  // Tells whether or not this function can be optimized.
+  inline bool IsOptimizable();
+
   // Mark this function for lazy recompilation. The function will be
   // recompiled the next time it is executed.
   void MarkForLazyRecompilation();