Move booting to RubyXCompiler init

Also pass the source into the compile method.
This way compiler can be reused for subsequent compile.
Does remove some double boots, but no major time save

test/mom/helper.rb

@@ -4,8 +4,6 @@ module Risc
   module Statements
 
     def setup
-      Parfait.boot!
-      Risc::Builtin.boot_functions
     end
 
     def preamble
@@ -31,7 +29,7 @@ module Risc
     end
     def produce_instructions
       assert @expect , "No output given"
-      linker = RubyX::RubyXCompiler.new(as_test_main).ruby_to_risc(:interpreter)
+      linker = RubyX::RubyXCompiler.new.ruby_to_risc(as_test_main,:interpreter)
       compiler = linker.assemblers.find{|c| c.callable.name == :main and c.callable.self_type.object_class.name == :Test}
       compiler.instructions
     end