gcstress: libcore.java.util.stream.CollectorsTest can timeout

Add the test to list of expected timeouts.

Change-Id: I701bd3a53e86153834f9fcf3e7207024c21a0211
diff --git a/tools/libcore_gcstress_debug_failures.txt b/tools/libcore_gcstress_debug_failures.txt
index 047543d..a5422af 100644
--- a/tools/libcore_gcstress_debug_failures.txt
+++ b/tools/libcore_gcstress_debug_failures.txt
@@ -41,6 +41,7 @@
           "libcore.java.lang.StringTest#testFastPathString_wellFormedUtf8Sequence",
           "libcore.java.math.BigIntegerTest#test_Constructor_IILjava_util_Random",
           "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.tests.java.lang.ProcessManagerTest#testSleep",
           "org.apache.harmony.tests.java.math.BigIntegerConstructorsTest#testConstructorPrime"