Implement simple switch statements as nested if/else.

tests/compiler/dart2js_native/dart2js_native.status

Index: tests/compiler/dart2js_native/dart2js_native.status
diff --git a/tests/compiler/dart2js_native/dart2js_native.status b/tests/compiler/dart2js_native/dart2js_native.status
index 84d774a951e2ab88abefab659e23a8b3f5d5daee..fc8e19a427072bc740feff4fa6f4eea6ea416f26 100644
--- a/tests/compiler/dart2js_native/dart2js_native.status
+++ b/tests/compiler/dart2js_native/dart2js_native.status
@@ -25,12 +25,12 @@ compute_this_script_test: RuntimeError # receiver.get$_collection$_nums is not a
 event_loop_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
 inference_of_helper_methods_test: RuntimeError # Please triage this failure.
 internal_library_test: RuntimeError # receiver.get$_collection$_nums is not a function
-mirror_intercepted_field_test: Crash # (switch (type){case ...  Unhandled node
+mirror_intercepted_field_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
 native_closure_identity_frog_test: RuntimeError # invoke is not a function
 native_exception2_test: RuntimeError # Please triage this failure.
 native_exception_test: RuntimeError # J.getInterceptor(...).toString$0 is not a function
 native_method_inlining_test: RuntimeError # Please triage this failure.
-native_mirror_test: Crash # (switch (type){case ...  Unhandled node
+native_mirror_test: Crash # (try {return f(arg1,arg2);}finally {Zone._leave(old);}): try/finally
 native_mixin_field_test: RuntimeError # Please triage this failure.
 native_mixin_with_plain_test: RuntimeError # Please triage this failure.
 native_no_such_method_exception3_frog_test: RuntimeError # Please triage this failure.