Reduce number of count checks for > 2

Author: lizmat

src/core/Hash.nqp

@@ -10,23 +10,16 @@ sub hash(*%new) {
 sub sorted_keys($hash) {
     my @keys := nqp::list_s();
 
+    # not empty
     if nqp::elems($hash) -> int $count {
         my $iter := nqp::iterator($hash);
         nqp::while(
           $iter,
           nqp::push_s(@keys,nqp::iterkey_s(nqp::shift($iter)))
         );
 
-        if $count == 1 {
-            # all ok already
-        }
-        elsif $count == 2 {
-            # swap if necessary
-            if nqp::atpos_s(@keys, 0) gt nqp::atpos_s(@keys, 1) {
-                nqp::push_s(@keys, nqp::shift_s(@keys));
-            }
-        }
-        else {
+        # need to do actual sorting
+        if $count > 2 {
             # need to do actual sorting
             sub sift_down(@a, int $start, int $end) {
                 my int $root := $start;
@@ -68,6 +61,12 @@ sub sorted_keys($hash) {
                 sift_down(@keys, 0, $end);
             }
         }
+        # swap if necessary
+        else {
+            nqp::push_s(@keys, nqp::shift_s(@keys))
+              if $count == 2
+              && nqp::atpos_s(@keys, 0) gt nqp::atpos_s(@keys, 1);
+        }
     }
 
     @keys