Null created elements in support to avoid leaks in IE. Tested IE6-8. …

…Leaks are contained to the byte. Fixes #9294.

src/support.js

@@ -245,6 +245,9 @@ jQuery.support = (function() {
 		}
 	}
 
+	// Null connected elements to avoid leaks in IE
+	marginDiv = div = input = null;
+
 	return support;
 })();