Add a missing entry to all_archs[], the lack of which was causing
the test system to run arm64 tests on non-arm64 platforms.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14369 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/tests/arch_test.c b/tests/arch_test.c
index ef00785..a39da6a 100644
--- a/tests/arch_test.c
+++ b/tests/arch_test.c
@@ -29,6 +29,7 @@
    "ppc64",
    "ppc64le",
    "arm",
+   "arm64",
    "s390x",
    "mips32",
    "mips64",