[tls] Disable TLS tests on ARM64 for now

These tests currently fail on ARM64.

ZX-1646

Change-Id: I63932a3f8c6d4668832e8171378b16dd430d0a7a
diff --git a/third_party/nacl-ported-tests/tls/tls.cc b/third_party/nacl-ported-tests/tls/tls.cc
index b3ef18c..93af717 100644
--- a/third_party/nacl-ported-tests/tls/tls.cc
+++ b/third_party/nacl-ported-tests/tls/tls.cc
@@ -11,6 +11,9 @@
 #include <stdio.h>
 #include "gtest/gtest.h"
 
+// TODO(ZX-1646): Make this work on ARM64.
+#if !defined(__aarch64__)
+
 namespace {
 
 class TEST_NAME : public ::testing::Test {
@@ -106,3 +109,5 @@
   }
 #endif
 }
+
+#endif