Correctly initialize regexp global cache.

test/mjsunit/regress/regress-148378.js

Index: test/mjsunit/regress/regress-148378.js
diff --git a/test/mjsunit/regress/regress-2185.js b/test/mjsunit/regress/regress-148378.js
similarity index 90%
copy from test/mjsunit/regress/regress-2185.js
copy to test/mjsunit/regress/regress-148378.js
index 895f322fc63880b2a5c3f0480673d6f01cace9cd..d37cea1cf75b02888ec59231c65b5b6ac436d45c 100644
--- a/test/mjsunit/regress/regress-2185.js
+++ b/test/mjsunit/regress/regress-148378.js
@@ -25,12 +25,14 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-var a = [];
+"a".replace(/a/g, function() { return "c"; });
 
-for (var i = 0; i < 2; i++) {
-  for (var j = 0; j < 30000; j++) {
-    a.push(j);
+function test() {
+  try {
+    test();
+  } catch(e) {
+    "b".replace(/(b)/g, function() { return "c"; });
   }
 }
 
-a.sort(function(a, b) { return a - b; } );
+test();