Add ForkJoinPool* threads to 911 Ignored regex

CTS tests now sometimes have a ForkJoinPool thread live during test
running. This thread needs to be ignored by our test.

Test: ./test.py --host
Test: atest CtsJvmtiRunTest911HostTestCases
Bug: 144234269
Change-Id: I3e9d64903f680ecdd6994d5ae1f1fa6362feda10
diff --git a/test/911-get-stack-trace/src/art/PrintThread.java b/test/911-get-stack-trace/src/art/PrintThread.java
index 798db06..94f3a33 100644
--- a/test/911-get-stack-trace/src/art/PrintThread.java
+++ b/test/911-get-stack-trace/src/art/PrintThread.java
@@ -42,7 +42,7 @@
   // may not exist depending on the environment.
   public final static String IGNORE_THREAD_NAME_REGEX =
       "Binder:|RenderThread|hwuiTask|Jit thread pool worker|Instr:|JDWP|Profile Saver|main|" +
-      "queued-work-looper|InstrumentationConnectionThread|intel_svc_streamer_thread";
+      "queued-work-looper|InstrumentationConnectionThread|intel_svc_streamer_thread|ForkJoinPool";
   public final static Matcher IGNORE_THREADS =
       Pattern.compile(IGNORE_THREAD_NAME_REGEX).matcher("");