Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/compiler/regress-3218915.js

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+// Flags: --allow-natives-syntax
+
 // Regression test for failure to deoptimize properly when the most recent
 // side effect occurred in a comma expression in an effect context.
 
 // An unoptimizable function, calling it is a side effect.
 function side_effect() { try {} finally {} return "wrong"; }
 
 // A function to observe the value of its first argument.
 function observe(x, y) { try {} finally {} return x; }
 
 // If we optimize for x a smi, then x a string will deopt.  The side effect
 // immediately before the deopt is in a comma expresion in an effect context
 // (i.e., itself the left subexpression of a comma expression).
 function test(x) { return observe(this, ((0, side_effect()), x + 1)); }
 
 // Run test enough times to get it optimized.
-for (var i = 0; i < 1000000; ++i) test(0);
+for (var i = 0; i < 5; ++i) test(0);
+%OptimizeFunctionOnNextCall(test);
+test(0);
 
 // Force test to deopt.  If it behaves normally, it should return the global
 // object.  If the value of the call to side_effect() is lingering after the
 // deopt, it will return the string "wrong".
 assertFalse(test("a") === "wrong");