added proper template function instantiation caching

tests/to_parse.krak

@@ -48,6 +48,7 @@ fun some_other_function(in: bool): float {
 fun main(): int {
     var a = id<int>(7)
     simple_println(a)
+    var b = id<int>(8)
     /*var b = id<*char>("Double down time")*/
     /*simple_println(b)*/
     simple_println(id<char>("Double down time"))