ZJIT: Inline simple SendWithoutBlockDirect (ruby#14888)

Copy the YJIT simple inliner except for the kwargs bit. It works great!

Author: tekknolagi

zjit.rb

@@ -176,6 +176,7 @@ def stats_string
       :optimized_send_count,
       :iseq_optimized_send_count,
       :inline_cfunc_optimized_send_count,
+      :inline_iseq_optimized_send_count,
       :non_variadic_cfunc_optimized_send_count,
       :variadic_cfunc_optimized_send_count,
     ], buf:, stats:, right_align: true, base: :send_count)