Fix dart2dart status for tests/lib.

tests/lib/lib.status

Index: tests/lib/lib.status
diff --git a/tests/lib/lib.status b/tests/lib/lib.status
index 7eae63782fc5ccdd7479ddd2f32fa95243b10f15..ef53bd48b397e5f4b7dda4ed008cf939425ebdc0 100644
--- a/tests/lib/lib.status
+++ b/tests/lib/lib.status
@@ -58,6 +58,12 @@ crypto/sha256_test: Slow, Pass
 crypto/sha1_test: Slow, Pass
 async/timer_not_available_test: Fail, OK # only meant to test when there is no way to
                                          # implement timer (currently only in d8)
+
+[ $compiler == dart2dart ]
+mirrors/mirrors_test: Fail              # Issue 10957
+mirrors/library_uri_package_test: Fail  # Issue 10957
+async/run_async6_test: Fail             # Issue 10957 - may be related to issue 10910
+
 [ $runtime == safari]
  # Bug in JSC: the test only passes when being debugged.
 crypto/hmac_md5_test: Fail, Pass