Implement simple switch statements as nested if/else.

tests/isolate/isolate.status

Index: tests/isolate/isolate.status
diff --git a/tests/isolate/isolate.status b/tests/isolate/isolate.status
index e34494f6c622c04d5e50ddab2ef77da2c20259a6..d27e225556d9f9b62e838f6a0c3ab91f37ae3b9d 100644
--- a/tests/isolate/isolate.status
+++ b/tests/isolate/isolate.status
@@ -130,13 +130,13 @@ bool_from_environment_default_value_test: Crash # (try {return f(arg1,arg2);}fin
 capability_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
 compile_time_error_test/none: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
 count_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
-cross_isolate_message_test: Crash # (switch (msg[0]){cas...  Unhandled node
+cross_isolate_message_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
 deferred_in_isolate2_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
 deferred_in_isolate_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
 function_send_test: Crash # (try {p.send(func);}finally {p.send(0);}): try/finally
 handle_error2_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
-handle_error3_test: Crash # (switch (state2){cas...  Unhandled node
-handle_error_test: Crash # (switch (state){case...  Unhandled node
+handle_error3_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
+handle_error_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
 illegal_msg_function_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
 illegal_msg_mirror_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
 int_from_environment_default_value_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally