Move kernel baseline tests to front_end.

pkg/front_end/test/fasta/rasta/for_loop.dart.direct.expect

-library;
-import self as self;
-import "dart:core" as core;
-
-static method main() → dynamic {
-  core::int c = new core::DateTime::now().millisecondsSinceEpoch;
-  for (core::int i = 0; i.<(100); i = i.+(1)) {
-    core::print(let final dynamic #t1 = i in let final dynamic #t2 = i = #t1.+(1) in #t1);
-  }
-  for (core::int i = 0; i.<(100); c.<(42) ? throw "fisk" : i = i.+(1)) {
-    core::print(let final dynamic #t3 = i in let final dynamic #t4 = i = #t3.+(1) in #t3);
-  }
-}