Little perfomance fix for Array#split.

Calculating -------------------------------------
before    40.770k i/100ms
after    58.464k i/100ms
-------------------------------------------------
before    629.568k (± 5.0%) i/s -      3.180M
after      1.159M (± 4.5%) i/s -      5.788M

1 files changed, 6 insertions, 10 deletions

diff --git a/activesupport/lib/active_support/core_ext/array/grouping.rb b/activesupport/lib/active_support/core_ext/array/grouping.rb
index 87ae052eb0..34af83d1ab 100644
--- a/activesupport/lib/active_support/core_ext/array/grouping.rb
+++ b/activesupport/lib/active_support/core_ext/array/grouping.rb
@@ -100,17 +100,13 @@ class Array
         results
       end
     else
-      results, arr = [[]], self.dup
-      until arr.empty?
-        if (idx = arr.index(value))
-          results.last.concat(arr.shift(idx))
-          arr.shift
-          results << []
-        else
-          results.last.concat(arr.shift(arr.size))
-        end
+      arr = self.dup
+      result = []
+      while (idx = arr.index(value))
+        result << arr.shift(idx)
+        arr.shift
       end
-      results
+      result << arr
     end
   end
 end