Update libcore expectations for gcstress+debug+host

Mark a couple of tests as failing:

* jsr166.ForkJoinPoolTest#testIsQuiescent
* org.apache.harmony.luni.tests.internal.net.www.protocol.http.HttpURLConnectionTest#testUsingProxySelector

Bug: 189826569
Test: art/tools/run-libcore-tests.sh --mode host -j 36 --gcstress \
      --debug 'jsr166.StampedLockTest#testWriteAfterReadLock'
Change-Id: Ib7aff6b596cc323e3e742a4fd211786877875366
diff --git a/tools/libcore_gcstress_debug_failures.txt b/tools/libcore_gcstress_debug_failures.txt
index 64d75a3..0153106 100644
--- a/tools/libcore_gcstress_debug_failures.txt
+++ b/tools/libcore_gcstress_debug_failures.txt
@@ -32,7 +32,8 @@
   description: "Timeouts on host with gcstress and debug.",
   result: EXEC_FAILED,
   modes: [host],
-  names: ["jsr166.StampedLockTest#testWriteAfterReadLock",
+  names: ["jsr166.ForkJoinPoolTest#testIsQuiescent",
+          "jsr166.StampedLockTest#testWriteAfterReadLock",
           "jsr166.StampedLockTest#testReadTryLock_Interruptible",
           "jsr166.StampedLockTest#testReadLockInterruptibly_Interruptible",
           "jsr166.StampedLockTest#testReadLockInterruptibly",
@@ -43,6 +44,7 @@
           "libcore.java.math.BigIntegerTest#test_probablePrime",
           "libcore.java.util.stream.CollectorsTest#counting_largeStream",
           "org.apache.harmony.luni.tests.internal.net.www.protocol.http.HttpURLConnectionTest#testUsingProxy",
+          "org.apache.harmony.luni.tests.internal.net.www.protocol.http.HttpURLConnectionTest#testUsingProxySelector",
           "org.apache.harmony.tests.java.lang.ProcessManagerTest#testSleep",
           "org.apache.harmony.tests.java.math.BigIntegerConstructorsTest#testConstructorPrime"
   ]