Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/external-array.js

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+// Flags: --allow-natives-syntax
+
 // This is a regression test for overlapping key and value registers.
 function f(a) {
   a[0] = 0;
   a[1] = 0;
 }
 
 var a = new Int32Array(2);
-for (var i = 0; i < 1000000; i++) {
+for (var i = 0; i < 5; i++) {
   f(a);
 }
+%OptimizeFunctionOnNextCall(f);
+f(a);
 
 assertEquals(0, a[0]);
 assertEquals(0, a[1]);
 
 // Test the correct behavior of the |length| property (which is read-only).
 a = new Int32Array(42);
 assertEquals(42, a.length);
 a.length = 2;
 assertEquals(42, a.length);
 assertTrue(delete a.length);
 a.length = 2
 assertEquals(2, a.length);
 
 // Test the correct behavior of the |BYTES_PER_ELEMENT| property (which is
 // "constant", but not read-only).
 a = new Int32Array(2);
 assertEquals(4, a.BYTES_PER_ELEMENT);
 a.BYTES_PER_ELEMENT = 42;
 assertEquals(42, a.BYTES_PER_ELEMENT);
 a = new Uint8Array(2);
 assertEquals(1, a.BYTES_PER_ELEMENT);
 a = new Int16Array(2);
 assertEquals(2, a.BYTES_PER_ELEMENT);