Move the Main instruction from register to virtual

also needs a branch in register.
This way the register level is self sufficient
(noticed while writing debugger)

lib/register/passes/main_implementation.rb

@@ -0,0 +1,17 @@
+module Register
+
+  # "Boot" the virtual machine at the function given
+  # meaning jump to that function currently. Maybe better to do some machine setup
+  # and possibly some cleanup/exit has to tie in, but that is not this day
+
+  class MainImplementation
+    def run block
+      block.codes.dup.each do |code|
+        next unless code.is_a? Virtual::VirtualMain
+        branch = Register::Branch.new( code.method.source.blocks.first )
+        block.replace(code , branch )
+      end
+    end
+  end
+  Virtual.machine.add_pass "Register::MainImplementation"
+end