Skip wasm tests on dart2js

Bug: #37882
Change-Id: Iceccc5805bcdadf003d8e753c7f86f915d72bf39
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/118662
Commit-Queue: Liam Appelbe <[email protected]>
Reviewed-by: Alexander Markov <[email protected]>

Author: liamappelbe

tests/lib_2/lib_2_dart2js.status

@@ -23,6 +23,7 @@ html/xhr_test: Slow
 isolate/*: SkipByDesign # No support for dart:isolate in dart4web (http://dartbug.com/30538)
 mirrors/*: SkipByDesign # Mirrors not supported on web in Dart 2.0.
 profiler/metrics_num_test: Skip # Because of an int / double type test.
+wasm/*: SkipByDesign # dart:wasm not currently supported on web.
 
 [ $compiler != dart2js ]
 async/dart2js_uncaught_error_test: Skip # JS-integration only test