Move kernel baseline tests to front_end.

pkg/front_end/test/fasta/rasta/issue_000004.dart.dartk.expect

-library;
-import self as self;
-import "package:expect/expect.dart" as exp;
-
-static field dynamic global;
-static method fact4() → dynamic {
-  dynamic f = 1;
-  for (dynamic n in <dynamic>[1, 2, 3, 4]) {
-    f = f.*(n);
-  }
-  return f;
-}
-static method fact5() → dynamic {
-  dynamic f = 1;
-  dynamic n;
-  for (final dynamic #t1 in <dynamic>[1, 2, 3, 4, 5]) {
-    n = #t1;
-    f = f.*(n);
-  }
-  return f;
-}
-static method fact6() → dynamic {
-  dynamic f = 1;
-  for (final dynamic #t2 in <dynamic>[1, 2, 3, 4, 5, 6]) {
-    self::global = #t2;
-    f = f.*(self::global);
-  }
-  return f;
-}
-static method main() → dynamic {
-  exp::Expect::isTrue(self::fact4().==(24));
-  exp::Expect::isTrue(self::fact5().==(120));
-  exp::Expect::isTrue(self::fact6().==(720));
-}