Make RegExp objects not callable.

test/mjsunit/number-string-index-call.js

Index: test/mjsunit/number-string-index-call.js
diff --git a/test/mjsunit/number-string-index-call.js b/test/mjsunit/number-string-index-call.js
index 4391917c20f08b0a874e0fa8783f50f436d9e4be..85b79d1ca29b74fb15ea0f0597fc187ca3bac243 100644
--- a/test/mjsunit/number-string-index-call.js
+++ b/test/mjsunit/number-string-index-call.js
@@ -25,8 +25,7 @@
 // (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: --call_regexp
-var callbacks = [ function() { return 'foo'; }, "nonobject", /abc/ ];
+var callbacks = [ function() {return 'foo'}, "nonobject", /abc/ ];
 assertEquals('foo', callbacks['0']());
 assertThrows("callbacks['1']()");
-assertEquals(['abc'], callbacks['2']("abcdefg"));
+assertThrows("callbacks['2']('abcdefg')");