Also make risc compilers a linked lists

also via util::compiler_ist
leave collection as much in place as possible
(though collections and seperate block_compilers are about to go)

test/vool/class_send/test_class_send_inherited.rb

@@ -23,7 +23,7 @@ module Vool
     def setup
       source = "class Integer < Data4;def +(other);X.int_operator(:+);end;end;" + class_main
       ret = RubyX::RubyXCompiler.new(RubyX.default_test_options).ruby_to_mom(source)
-      @ins = ret.compilers.find_compiler{|c|c.callable.name==:main}.mom_instructions.next
+      @ins = ret.compilers.find_compiler_name(:main).mom_instructions.next
     end
     def test_array
       check_array [MessageSetup,ArgumentTransfer,SimpleCall,SlotLoad,