implement DynamicJump for Arm

which is in fact the same as return (moving address into pc)

lib/arm/translator.rb

@@ -65,9 +65,10 @@ module Arm
       ArmMachine.b( code.method.binary )
     end
 
-    def translate_FunctionReturn code
+    def translate_FunctionReturn( code )
       ArmMachine.mov( :pc , code.register)
     end
+    alias :translate_DynamicJump :translate_FunctionReturn
 
     def translate_LoadConstant( code )
       constant = code.constant

test/arm/test_translator.rb

@@ -0,0 +1,17 @@
+require_relative 'helper'
+
+module Arm
+  class TestStack < MiniTest::Test
+
+    def test_init
+      assert Translator.new
+    end
+
+    def test_dynamic
+      trans = Translator.new
+      jump = Risc::DynamicJump.new("" , :r1)
+      res = trans.translate jump
+      assert :r1 , res.from
+    end
+  end
+end