Move kernel baseline tests to front_end.

pkg/kernel/testcases/strong-mode/call.baseline.txt

-// Too few positional arguments (call.dart:30:25)
-// Too few positional arguments (call.dart:31:30)
-// Too few positional arguments (call.dart:35:26)
-// Too few positional arguments (call.dart:36:27)
-// Too few positional arguments (call.dart:37:32)
-library;
-import self as self;
-import "dart:core" as core;
-
-class Callable extends core::Object {
-  constructor •() → void
-    : super core::Object::•()
-    ;
-  method call(dynamic x) → dynamic {
-    return "string";
-  }
-}
-class CallableGetter extends core::Object {
-  constructor •() → void
-    : super core::Object::•()
-    ;
-  get call() → dynamic
-    return new self::Callable::•();
-}
-static method main() → dynamic {
-  (dynamic) → dynamic closure = (dynamic x) → dynamic => x;
-  dynamic int1 = closure.call(1);
-  dynamic int2 = closure.call(1);
-  dynamic int3 = closure.call.call(1);
-  dynamic int4 = closure.call.call.call(1);
-  self::Callable callable = new self::Callable::•();
-  dynamic string1 = callable.{self::Callable::call}(1);
-  dynamic string2 = callable.{self::Callable::call}(1);
-  dynamic string3 = callable.{self::Callable::call}.call(1);
-  dynamic string4 = callable.{self::Callable::call}.call.call(1);
-  self::CallableGetter callableGetter = new self::CallableGetter::•();
-  dynamic string5 = callableGetter.call(1);
-  dynamic string6 = callableGetter.{self::CallableGetter::call}.call(1);
-  dynamic string7 = callableGetter.{self::CallableGetter::call}.call(1);
-  dynamic string8 = callableGetter.{self::CallableGetter::call}.call.call(1);
-  dynamic nothing1 = closure.call();
-  dynamic nothing2 = closure.call();
-  dynamic nothing3 = closure.call.call();
-  dynamic nothing4 = closure.call.call.call();
-  dynamic nothing5 = callable.{self::Callable::call}();
-  dynamic nothing6 = callable.{self::Callable::call}();
-  dynamic nothing7 = callable.{self::Callable::call}.call();
-  dynamic nothing8 = callable.{self::Callable::call}.call.call();
-  dynamic nothing9 = callableGetter.call();
-  dynamic nothing10 = callableGetter.{self::CallableGetter::call}.call();
-  dynamic nothing11 = callableGetter.{self::CallableGetter::call}.call();
-  dynamic nothing12 = callableGetter.{self::CallableGetter::call}.call.call();
-}