[torque] add test for loop that only exits from the middle

This was fixed when introducing the IR.

Bug: v8:8216
Change-Id: Iebb212a2c21499b1738832457b660038e3a48975
Reviewed-on: https://chromium-review.googlesource.com/c/1297313Reviewed-by: Daniel Clifford <danno@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56931}

test/torque/test-torque.tq

@@ -392,6 +392,16 @@ module test {
       j++;
     }
     check(sum == 7);
+
+    j = 0;
+    try {
+      for (;;) {
+        if (++j == 10) goto Exit;
+      }
+    }
+    label Exit {
+      check(j == 10);
+    }
   }
 
   macro TestSubtyping(x: Smi) {