A64: Synchronize with r15814.

test/cctest/cctest.status

 # Copyright 2011 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 29 matching lines @@
 test-serialize/DependentTestThatAlwaysFails: FAIL
 
 # This test always fails.  It tests that LiveEdit causes abort when turned off.
 test-debug/LiveEditDisabled: FAIL
 
 # TODO(gc): Temporarily disabled in the GC branch.
 test-log/EquivalenceOfLoggingAndTraversal: PASS || FAIL
 
 # We do not yet shrink weak maps after they have been emptied by the GC
 test-weakmaps/Shrinking: FAIL
+test-weaksets/WeakSet_Shrinking: FAIL
 
 # Deferred stack trace formatting is temporarily disabled.
 test-heap/ReleaseStackTraceData: PASS || FAIL
 
 # Boot up memory use is bloated in debug mode.
 test-mark-compact/BootUpMemoryUse: PASS, PASS || FAIL if $mode == debug
 
 ##############################################################################
 [ $arch == a64 ]
 
@@ skipping 57 matching lines @@
 
 # platform-tls.h does not contain an ANDROID-related header.
 test-platform-tls/FastTLS: SKIP
 
 # This test times out.
 test-threads/ThreadJoinSelf: SKIP
 
 ##############################################################################
 [ $arch == nacl_ia32 || $arch == nacl_x64 ]
 
+# NaCl builds have problems with threaded tests since Pepper_28.
+# V8 Issue 2786
+test-api/Threading1: SKIP
+test-lockers/MultithreadedParallelIsolates: SKIP
+test-lockers/ExtensionsRegistration: SKIP
+
 # These tests fail as there is no /tmp directory in Native Client.
 test-log/LogAccessorCallbacks: SKIP
 test-log/LogCallbacks: SKIP
 test-log/ProfLazyMode: SKIP
 
 # Native Client doesn't support sockets.
 test-debug/DebuggerAgent: SKIP
 test-debug/DebuggerAgentProtocolOverflowHeader: SKIP
 test-sockets/Socket: SKIP
 
 # Profiling doesn't work on Native Client.
 test-cpu-profiler/*: SKIP