Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/regress/regress-1210.js

Index: test/mjsunit/regress/regress-1210.js
diff --git a/test/mjsunit/regress/regress-1210.js b/test/mjsunit/regress/regress-1210.js
index 9c708a580544748e7ca9496055bf2a1c811c209e..7d4735a40ced52484b97e221019fd68089b5d61f 100644
--- a/test/mjsunit/regress/regress-1210.js
+++ b/test/mjsunit/regress/regress-1210.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
+
 // Deoptimization of the key expression in an arguments access should see
 // the arguments object as the value of the receiver.
 
@@ -43,6 +45,8 @@ function test() {
 
 // Run enough to optimize assuming global 'a' is a smi.
 for (var i = 0; i < 1000000; ++i) test(0);
+%OptimizeFunctionOnNextCall(test);
+test(0);
 
 a = "hello";
 test(0);