Workaround bug 338633. gdbserver_tests/nlcontrolc.vgtest hangs on arm64.

Disable the test on arm64 for now to keep make regtest from hanging.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14376 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/gdbserver_tests/nlcontrolc.vgtest b/gdbserver_tests/nlcontrolc.vgtest
index 8ff8355..7cb9c2f 100644
--- a/gdbserver_tests/nlcontrolc.vgtest
+++ b/gdbserver_tests/nlcontrolc.vgtest
@@ -10,7 +10,8 @@
 args: 1000000000 1000000000 1000000000 BSBSBSBS
 vgopts: --tool=none --vgdb=yes --vgdb-error=0 --vgdb-prefix=./vgdb-prefix-nlcontrolc
 stderr_filter: filter_stderr
-prereq: test -e gdb -a -f vgdb.invoker
+# Bug 338633 nlcontrol hangs on arm64 currently.
+prereq: test -e gdb -a -f vgdb.invoker && ! ../tests/arch_test arm64
 progB: gdb
 argsB: --quiet -l 60 --nx ./sleepers
 stdinB: nlcontrolc.stdinB.gdb