tests: added eqeq test

tests: sum-test: emproved test sum of int with various types of second argument (byte, short and etc)
tests: hello2 minor fix in test

backend.native/tests/codegen/function/sum.kt

@@ -1 +1,8 @@
-fun sum(a:Int, b:Int) = a + b
+fun sumIB(a:Int, b:Byte  ) = a + b
+fun sumIS(a:Int, b:Short ) = a + b
+fun sumII(a:Int, b:Int   ) = a + b
+fun sumIL(a:Int, b:Long  ) = a + b
+fun sumIF(a:Int, b:Float ) = a + b
+fun sumID(a:Int, b:Double) = a + b
+
+fun modID(a:Int, b:Double) = a % b