Add test to check that Function.caller must not expose native functions.

test/mjsunit/regress/regress-105.js

Index: test/mjsunit/regress/regress-105.js
diff --git a/test/mjsunit/regress/regress-2489.js b/test/mjsunit/regress/regress-105.js
similarity index 80%
copy from test/mjsunit/regress/regress-2489.js
copy to test/mjsunit/regress/regress-105.js
index 882c4f794a88e24d1d64e86a466b27c39f51e625..9a4d5c4744a3f970101c4a17d37a21ad8f618f83 100644
--- a/test/mjsunit/regress/regress-2489.js
+++ b/test/mjsunit/regress/regress-105.js
@@ -25,26 +25,20 @@
 // (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
-
-"use strict";
-
-function f(a, b) {
-  return g("c", "d");
+var custom_valueOf = function() {
+  assertEquals(Number, custom_valueOf.caller);
+  return 2;
 }
 
-function g(a, b) {
-  g.constructor.apply(this, arguments);
+var custom_toString = function() {
+  assertEquals(String, custom_toString.caller);
+  return "I used to be an adventurer like you";
 }
 
-g.constructor = function(a, b) {
-  assertEquals("c", a);
-  assertEquals("d", b);
-}
+var object = {};
+object.valueOf = custom_valueOf;
+object.toString = custom_toString;
+
+assertEquals(2, Number(object));
+assertEquals('I', String(object)[0]);
 
-f("a", "b");
-f("a", "b");
-%OptimizeFunctionOnNextCall(f);
-f("a", "b");
-g.x = "deopt";
-f("a", "b");