Move kernel baseline tests to front_end.

pkg/front_end/testcases/statements.dart.direct.expect

 library;
 import self as self;
 import "dart:core" as core;
 
 static method foo() → dynamic {
   try {
     return;
   }
   finally {
     core::print("Hello from finally block!");
@@ skipping 130 matching lines @@
   #L15:
   while (true)
     #L16:
     {
       core::print("Hello from while!");
       if((i = i.+(1)).<(3))
         break #L16;
       break #L15;
     }
 }