Test only dwarf cstack on J9

Author: jbachorik

ddprof-test/src/test/java/com/datadoghq/profiler/junit/CStackInjector.java

@@ -51,7 +51,7 @@ public Stream<TestTemplateInvocationContext> provideTestTemplateInvocationContex
             return Stream.of(new ParameterizedTestContext("no", retryCount));
         } else {
             return Stream.of(valueSource.strings()).
-                    filter(param -> (!Platform.isJ9() || !param.startsWith("vm"))).
+                    filter(param -> (!Platform.isJ9() || "dwarf".equals(param))).
                     map(param -> new ParameterizedTestContext(param, retryCount));
         }
     }

ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/SmokeWallTest.java

@@ -16,6 +16,7 @@
 import java.util.concurrent.ExecutionException;
 
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assumptions.assumeFalse;
 
 public class SmokeWallTest extends CStackAwareAbstractProfilerTest {
     private ProfiledCode profiledCode;