Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/const-eval-init.js

Index: test/mjsunit/const-eval-init.js
diff --git a/test/mjsunit/const-eval-init.js b/test/mjsunit/const-eval-init.js
index 3f380d9d947f59f59f8d16c6a1fdb6f81c5b33da..d3503845d0c159f106fe7a68e95d41f14105413e 100644
--- a/test/mjsunit/const-eval-init.js
+++ b/test/mjsunit/const-eval-init.js
@@ -25,6 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+// Flags: --allow-natives-syntax
+
 // Test the handling of initialization of deleted const variables.
 // This only makes sense in local scopes since the declaration and
 // initialization of consts in the global scope happen at the same
@@ -67,9 +69,11 @@ function testAssignmentArgument(x) {
   assertEquals(7, x);
 }
 
-for (var i = 0; i < 10000; i++) {
+for (var i = 0; i < 5; i++) {
   testAssignmentArgument();
 }
+%OptimizeFunctionOnNextCall(testAssignmentArgument);
+testAssignmentArgument();
 assertEquals(6, x);
 
 __defineSetter__('x', function() { throw 42; });