moved slots to own directory

lib/compiler/basic_expressions.rb

@@ -13,7 +13,7 @@ module Compiler
 #    attr_reader :value
     def self.compile_integer expession , method , message
       int = Virtual::IntegerConstant.new(expession.value)
-      to = Virtual::NewReturn.new(Virtual::Integer , int)
+      to = Virtual::Return.new(Virtual::Integer , int)
       method.add_code Virtual::Set.new( to , int)
       to
     end
@@ -81,6 +81,6 @@ module Compiler
 
     def self.compile_variable expession, method , message
       method.add_code Virtual::InstanceGet.new(expession.name)
-      Virtual::NewReturn.new( Virtual::Mystery )
+      Virtual::Return.new( Virtual::Mystery )
     end
 end

lib/compiler/call_site_expression.rb

@@ -21,6 +21,6 @@ module Compiler
       method.add_code Virtual::MessageSend.new(expession.name , me , compiled_args) #and pass control
       # the effect of the method is that the NewMessage Return slot will be filled, return it
       # (this is what is moved _inside_ above loop for such expressions that are calls (or constants))
-      Virtual::NewReturn.new( method.return_type )
+      Virtual::Return.new( method.return_type )
     end
 end