Move kernel baseline tests to front_end.

pkg/front_end/test/fasta/mixin.dart.direct.expect

-library;
-import self as self;
-import "dart:core" as core;
-
-class B extends self::Object&M1&M2 {
-  constructor •(dynamic value) → void
-    : super self::Object&M1&M2::•()
-    ;
-}
-abstract class M1 extends core::Object {
-  constructor •() → void
-    : super core::Object::•()
-    ;
-  method m() → dynamic
-    return core::print("M1");
-}
-abstract class M2 extends core::Object {
-  constructor •() → void
-    : super core::Object::•()
-    ;
-  method m() → dynamic
-    return core::print("M2");
-}
-class C extends self::Object&M1&M2 {
-  constructor •(dynamic value) → void
-    : super self::Object&M1&M2::•()
-    ;
-}
-abstract class G1<T extends core::Object> extends core::Object {
-  constructor •() → void
-    : super core::Object::•()
-    ;
-  method m() → dynamic
-    return core::print(self::G1::T);
-}
-class D<S extends core::Object> extends self::D^G1<self::D::S> {
-  constructor •() → void
-    : super self::D^G1::•()
-    ;
-}
-abstract class Object&M1 extends core::Object implements self::M1 {
-  constructor •() → void
-    : super core::Object::•()
-    ;
-  method m() → dynamic
-    return core::print("M1");
-}
-abstract class Object&M1&M2 extends self::Object&M1 implements self::M2 {
-  constructor •() → void
-    : super self::Object&M1::•()
-    ;
-  method m() → dynamic
-    return core::print("M2");
-}
-abstract class D^G1<S extends core::Object> extends core::Object implements self::G1<self::D^G1::S> {
-  constructor •() → void
-    : super core::Object::•()
-    ;
-  method m() → dynamic
-    return core::print(self::D^G1::S);
-}
-static method main() → dynamic {
-  new self::B::•(null).m();
-  new self::C::•(null).m();
-  new self::D::•<dynamic>().m();
-  new self::D::•<core::int>().m();
-  new self::D::•<core::List<core::int>>().m();
-}