Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/compiler/recursive-deopt.js

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+// Flags: --allow-natives-syntax
 
 function f(n) {
   // Force deopt in both leaf case and when returning. To make
   // debugging easier, the operation that bails out (<<) is so simple
   // that it doesn't cause GCs.
   if (n == 0) return 1 << one;
   return f(n - 1) << one;
 }
 
-function RunTests() {
-  assertEquals(1 << 1, f(0));
-  assertEquals(1 << 2, f(1));
-  assertEquals(1 << 5, f(4));
-}
-
 
 var one = 1;
-for (var i = 0; i < 1000000; i++) RunTests();
+for (var i = 0; i < 5; i++) assertEquals(1 << 5, f(4));
+%OptimizeFunctionOnNextCall(f);
+assertEquals(1 << 5, f(4));
 
 var one = { valueOf: function() { return 1; } };
-for (var j = 0; j < 100000; j++) RunTests();
+assertEquals(1 << 5, f(4));