Remove some legacy codegen tests, move some to generated

compiler/testData/codegen/box/controlStructures/continueInWhile.kt

@@ -0,0 +1,16 @@
+fun foo(i: Int): Int {
+  var count = i;
+  var result = 0;
+  while(count > 0) {
+    count = count - 1;
+    if (count <= 2) continue;
+    result = result + count;
+  }
+  return result;
+}
+
+fun box(): String {
+  if (foo(4) != 3) return "Fail 1"
+  if (foo(5) != 7) return "Fail 2"
+  return "OK"
+}