Invalidate the enum cache when converting a transition across which the descriptors are shared.

test/mjsunit/regress/regress-convert-enum2.js

Index: test/mjsunit/regress/regress-convert-enum2.js
diff --git a/test/mjsunit/regress/regress-2249.js b/test/mjsunit/regress/regress-convert-enum2.js
similarity index 88%
copy from test/mjsunit/regress/regress-2249.js
copy to test/mjsunit/regress/regress-convert-enum2.js
index 07d687d8191ad469d09cbd86cd7ea12797a735d3..cdc7fbe2b68ee20cb77dd020e54ec94f43a14f61 100644
--- a/test/mjsunit/regress/regress-2249.js
+++ b/test/mjsunit/regress/regress-convert-enum2.js
@@ -25,9 +25,22 @@
 // (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: --gc-interval=10 --stress-compaction
-
 var o = {};
-o[Math.pow(2,30)-1] = 0;
-o[Math.pow(2,31)-1] = 0;
-o[1] = 0;
+o.a = 1;
+o.b = function() { return 1; };
+o.d = 2;
+
+for (var x in o) { }
+
+var o1 = {};
+o1.a = 1;
+o1.b = 10;
+o1.c = 20;
+
+var keys = ["a", "b", "c"];
+
+var i = 0;
+for (var y in o1) {
+  assertEquals(keys[i], y);
+  i += 1;
+}