Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/compiler/switch-bailout.js

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+// Flags: --allow-natives-syntax
+
 // Test that bailing out of the optimized compilation doesn't mess with
 // the labels in the AST.
 function f(x) {
   switch (x) {
     case "foo": return 87;
     case "bar": return 42;
   }
   return 99;
 }
 
-for (var i = 0; i < 10000; i++) f("foo");
+for (var i = 0; i < 5; i++) f("foo");
+%OptimizeFunctionOnNextCall(f);
+f("foo");
 assertEquals(42, f("bar"));