Move kernel baseline tests to front_end.

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

-library;
-import self as self;
-import "dart:core" as core;
-
-static method main() → dynamic {
-  #L1:
-  switch(1) {
-    #L2:
-    case 1:
-      {
-        {
-          "No fall-through error needed.";
-          break #L1;
-          ;
-        }
-      }
-    #L3:
-    case 2:
-      {
-        {
-          "Fall-through error needed.";
-          if(true) {
-            break #L1;
-          }
-        }
-        throw core::_fallThroughError();
-      }
-    #L4:
-    case 3:
-      {
-        try {
-          "No fall-through error needed.";
-        }
-        finally {
-          break #L1;
-        }
-      }
-    #L5:
-    case 4:
-      {
-        try {
-          "No fall-through error needed.";
-          break #L1;
-        }
-        finally {
-        }
-      }
-    #L6:
-    case 5:
-      {
-        try {
-          "Fall-through error needed.";
-        }
-        finally {
-        }
-        throw core::_fallThroughError();
-      }
-    #L7:
-    case 10000:
-      {
-        "Should be last. No fall-through error, falling through allowed here.";
-      }
-  }
-}