Wrong execution order of END block and at_exit callback

[andrykonchin]

END block should be called before at_exit callback

Example:

at_exit { puts "at_exit callback" }

END {
  puts "END code"
}

TruffleRuby:

at_exit callback
END code

Ruby 3.1.3:

END code
at_exit callback

Extracted from a discussion here #2800 (comment)

[andrykonchin]

Example of mixed END blocks and at_exit callbacks (it works on CRuby 2.7-3.2):

    it "runs them all in LIFO order" do
      ruby_exe(<<~RUBY).should == "at_exit#2\nEND#2\nat_exit#1\nEND#1\n"
        END { puts 'END#1' }
        at_exit { puts 'at_exit#1' }
        END { puts 'END#2' }
        at_exit { puts 'at_exit#2' }
      RUBY
    end

[andrykonchin]

Fixed in cfc35bb