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/risc/test_method_compiler.rb

@@ -5,11 +5,10 @@ module Risc
     include ScopeHelper
 
     def setup
-      Parfait.boot!
     end
 
     def in_test_vool(str)
-      vool = RubyX::RubyXCompiler.new(in_Test(str)).ruby_to_vool
+      vool = RubyX::RubyXCompiler.new.ruby_to_vool(in_Test(str))
       vool.to_mom(nil)
       vool
     end
@@ -65,7 +64,7 @@ module Risc
       assert_equal 2 , method.frame_type.variable_index(:a)
     end
     def constant_setup(input)
-      mom = RubyX::RubyXCompiler.new(in_Test(input)).ruby_to_mom
+      mom = RubyX::RubyXCompiler.new.ruby_to_mom(in_Test(input))
       assert_equal Mom::MomCompiler , mom.class
       compiler = mom.method_compilers.first
       assert_equal MethodCompiler , compiler.class