Move Kernel#with_yjit to Module#with_yjit

Merged: https://github.com/ruby/ruby/pull/12178

kernel.rb

@@ -290,7 +290,9 @@ module Kernel
       Primitive.rb_f_integer(arg, base, exception)
     end
   end
+end
 
+class Module
   # Internal helper for built-in initializations to define methods only when YJIT is enabled.
   # This method is removed in yjit_hook.rb.
   private def with_yjit(&block) # :nodoc:

yjit_hook.rb

@@ -4,6 +4,6 @@ if defined?(RubyVM::YJIT) && RubyVM::YJIT.enabled?
 end
 
 # Remove the helper defined in kernel.rb
-module Kernel
+class Module
   undef :with_yjit
 end