java/2016/12: add too-long-runtime solution for part 2

The program encoded in assembunny is constructed such  that running it
with c == 1 takes way too long time. As such, I need to decode the
program to understand what it's doing, and then implement it in Java
instead.

Author: saser

java/src/main/java/com/github/saser/adventofcode/year2016/day12/Day12.java

@@ -16,6 +16,7 @@ public static Result part2(Reader r) {
 
     private static Result solve(Reader r, int part) {
         var vm = VM.from(r);
+        vm.c(part == 2 ? 1 : 0);
         vm.runAll();
         return Result.ok(Integer.toString(vm.a()));
     }

java/src/test/java/com/github/saser/adventofcode/year2016/day12/Day12Test.java

@@ -27,22 +27,13 @@ public void part1Actual() throws IOException {
         }
     }
 
-    // @Test
-    // public void part2Example() {
-    //     var input = new StringReader("");
-    //     var output = "";
-    //     var result = Day12.part2(input);
-    //     Assert.assertEquals("no error", "", result.error);
-    //     Assert.assertEquals("correct output", output, result.answer);
-    // }
-
-    // @Test
-    // public void part2Actual() throws IOException {
-    //     try (var input = new FileReader("inputs/2016/12")) {
-    //         var output = "";
-    //         var result = Day12.part2(input);
-    //         Assert.assertEquals("no error", "", result.error);
-    //         Assert.assertEquals("correct output", output, result.answer);
-    //     }
-    // }
+     @Test
+     public void part2Actual() throws IOException {
+         try (var input = new FileReader("inputs/2016/12")) {
+             var output = "";
+             var result = Day12.part2(input);
+             Assert.assertEquals("no error", "", result.error);
+             Assert.assertEquals("correct output", output, result.answer);
+         }
+     }
 }