Disable tests for dartc.

compiler/javatests/com/google/dart/compiler/end2end/End2EndTests.java

Index: compiler/javatests/com/google/dart/compiler/end2end/End2EndTests.java
diff --git a/compiler/javatests/com/google/dart/compiler/end2end/End2EndTests.java b/compiler/javatests/com/google/dart/compiler/end2end/End2EndTests.java
index de8d8136e099a451328884c09f660f603d823a57..e66bab5d436e2e2efb0fefc8c986715d09cfbd38 100644
--- a/compiler/javatests/com/google/dart/compiler/end2end/End2EndTests.java
+++ b/compiler/javatests/com/google/dart/compiler/end2end/End2EndTests.java
@@ -22,7 +22,8 @@ public class End2EndTests extends TestSetup {
     TestSuite suite = new TestSuite("Dart end-to-end test suite.");
     suite.addTestSuite(IncrementalCompilationTest.class);
     suite.addTestSuite(IncrementalCompilation2Test.class);
-    suite.addTestSuite(IncrementalCompilationWithPrefixTest.class);
+    // TODO(8426): reenable the following test.
+    // suite.addTestSuite(IncrementalCompilationWithPrefixTest.class);
     return new End2EndTests(suite);
   }
 }