Re-enable array index dehoisting.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10826031

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12203 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/flag-definitions.h

@@ -200,7 +200,7 @@ DEFINE_bool(polymorphic_inlining, true, "polymorphic inlining")
 DEFINE_bool(use_osr, true, "use on-stack replacement")
 DEFINE_bool(array_bounds_checks_elimination, true,
             "perform array bounds checks elimination")
-DEFINE_bool(array_index_dehoisting, false,
+DEFINE_bool(array_index_dehoisting, true,
             "perform array index dehoisting")
 
 DEFINE_bool(trace_osr, false, "trace on-stack replacement")