[LLDB] Skip TestIOHandlerProcessSTDIO.py for Arm/AArch64 Linux

This patch disables TestIOHandlerProcessSTDIO.py for Arm/AArch64 Linux
to silence random test failures on buildbots. IO handler tests are known
to randomly fail on arm/aarch64 linux buildbots due to pexpect timeouts.

lldb/test/API/iohandler/stdio/TestIOHandlerProcessSTDIO.py

@@ -11,6 +11,7 @@ class TestIOHandlerProcessSTDIO(PExpectTest):
     # PExpect uses many timeouts internally and doesn't play well
     # under ASAN on a loaded machine..
     @skipIfAsan
+    @skipIf(oslist=["linux"], archs=["arm", "aarch64"])
     def test(self):
         self.build()
         self.launch(executable=self.getBuildArtifact("a.out"))