Move kernel baseline tests to front_end.

pkg/front_end/testcases/rasta/issue_000042.dart.dartk.expect

 library;
 import self as self;
 import "dart:core" as core;
 
 static method main() → dynamic {
   invalid-statement;
   {
     invalid-statement;
   }
   if(true) {
     invalid-statement;
   }
   #L1:
   switch(1) {
     #L2:
     case 1:
       invalid-statement;
     #L3:
     case 2:
       break #L1;
   }
   try {
   }
   on core::NoSuchMethodError catch(no-exception-var) {
   }
 }