move machine to module level

makes for shorter, more concise, access
also remove one more bug possibility
(reinitiation)

lib/arm/passes/call_implementation.rb

@@ -15,5 +15,5 @@ module Arm
       end
     end
   end
-  Virtual::Machine.instance.add_pass "Arm::CallImplementation"
+  Virtual.machine.add_pass "Arm::CallImplementation"
 end

lib/arm/passes/constant_implementation.rb

@@ -10,5 +10,5 @@ module Arm
       end
     end
   end
-  Virtual::Machine.instance.add_pass "Arm::ConstantImplementation"
+  Virtual.machine.add_pass "Arm::ConstantImplementation"
 end

lib/arm/passes/get_implementation.rb

@@ -9,5 +9,5 @@ module Arm
       end
     end
   end
-  Virtual::Machine.instance.add_pass "Arm::GetImplementation"
+  Virtual.machine.add_pass "Arm::GetImplementation"
 end

lib/arm/passes/main_implementation.rb

@@ -11,5 +11,5 @@ module Arm
       end
     end
   end
-  Virtual::Machine.instance.add_pass "Arm::MainImplementation"
+  Virtual.machine.add_pass "Arm::MainImplementation"
 end

lib/arm/passes/return_implementation.rb

@@ -9,5 +9,5 @@ module Arm
       end
     end
   end
-  Virtual::Machine.instance.add_pass "Arm::ReturnImplementation"
+  Virtual.machine.add_pass "Arm::ReturnImplementation"
 end

lib/arm/passes/save_implementation.rb

@@ -15,5 +15,5 @@ module Arm
       end
     end
   end
-  Virtual::Machine.instance.add_pass "Arm::SaveImplementation"
+  Virtual.machine.add_pass "Arm::SaveImplementation"
 end

lib/arm/passes/set_implementation.rb

@@ -9,5 +9,5 @@ module Arm
       end
     end
   end
-  Virtual::Machine.instance.add_pass "Arm::SetImplementation"
+  Virtual.machine.add_pass "Arm::SetImplementation"
 end

lib/arm/passes/transfer_implementation.rb

@@ -9,5 +9,5 @@ module Arm
       end
     end
   end
-  Virtual::Machine.instance.add_pass "Arm::TransferImplementation"
+  Virtual.machine.add_pass "Arm::TransferImplementation"
 end