Test only dwarf cstack on J9

Author: jbachorik

ddprof-test/src/test/java/com/datadoghq/profiler/cpu/CTimerSamplerTest.java

@@ -47,6 +47,8 @@ protected void before() {
     public void test(@CStack String cstack) throws ExecutionException, InterruptedException {
         // timer_create is available on Linux only
         assumeTrue(Platform.isLinux());
+        // On J9 we can use only "dwarf" cstack
+        assumeFalse(Platform.isJ9() && !"dwarf".equals(cstack));
         for (int i = 0, id = 1; i < 100; i++, id += 3) {
             profiledCode.method1(id);
         }

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;
@@ -33,6 +34,9 @@ protected void before() {
     @TestTemplate
     @ValueSource(strings = {"fp", "dwarf", "vm", "vmx"})
     public void test(@CStack String cstack) throws ExecutionException, InterruptedException {
+        // On J9 we can use only "dwarf" cstack
+        assumeFalse(Platform.isJ9() && !"dwarf".equals(cstack));
+
         for (int i = 0, id = 1; i < 100; i++, id += 3) {
             profiledCode.method1(id);
         }