[GR-29207] Always split Numeric#step

* It's above 100 AST nodes (SplittingMaxCalleeSize) but it's always worth splitting.
* Numeric#step is heavily used in OptCarrot.

Author: eregon

src/main/ruby/truffleruby/core/numeric.rb

@@ -93,6 +93,7 @@ def step(orig_limit = undefined, orig_step = undefined, by: undefined, to: undef
 
     self
   end
+  Truffle::Graal.always_split instance_method(:step) # above 100 nodes but always worth splitting
 
   def truncate
     Float(self).truncate