ZJIT: Move ivar stats out of "send" stats group

Previously, `:dynamic_setivar_count`, `:dynamic_getivar_count`, and
`:dynamic_definedivar_count` had a percentage to the right of them in
the printout with the denominator being `:send_count`.

These are not sends, so move them out of the group.

Author: XrXr

zjit.rb

@@ -129,9 +129,6 @@ def stats_string
       :send_count,
       :dynamic_send_count,
       :optimized_send_count,
-      :dynamic_setivar_count,
-      :dynamic_getivar_count,
-      :dynamic_definedivar_count,
       :iseq_optimized_send_count,
       :inline_cfunc_optimized_send_count,
       :inline_iseq_optimized_send_count,
@@ -140,6 +137,10 @@ def stats_string
       :variadic_cfunc_optimized_send_count,
     ], buf:, stats:, right_align: true, base: :send_count)
     print_counters([
+      :dynamic_setivar_count,
+      :dynamic_getivar_count,
+      :dynamic_definedivar_count,
+
       :compiled_iseq_count,
       :compiled_side_exit_count,
       :failed_iseq_count,