Ignore ZipFileTest and ZipInputStreamTest failures with CC.

These tests sometimes fail with a
java.util.concurrent.TimeoutException on ART Builbot's x86
and x86-64 concurrent collector configurations:
* libcore.java.util.zip.ZipFileTest#testZipFileWithLotsOfEntries
* libcore.java.util.zip.ZipInputStreamTest#testLongMessage

Bug: 26507762
Change-Id: I344d3ce4fbb4709025861ef2f009d768cc7524b8
diff --git a/tools/libcore_failures_concurrent_collector.txt b/tools/libcore_failures_concurrent_collector.txt
index 75d1eff..3d25d5f 100644
--- a/tools/libcore_failures_concurrent_collector.txt
+++ b/tools/libcore_failures_concurrent_collector.txt
@@ -22,5 +22,12 @@
   result: EXEC_FAILED,
   names: ["libcore.java.lang.OldSystemTest#test_gc"],
   bug: 26155567
+},
+{
+  description: "TimeoutException on host-x86-concurrent-collector",
+  result: EXEC_FAILED,
+  names: ["libcore.java.util.zip.ZipFileTest#testZipFileWithLotsOfEntries,
+           libcore.java.util.zip.ZipInputStreamTest#testLongMessage"],
+  bug: 26507762
 }
 ]