[lldb][test] skip on other archs on linux (llvm#11539)

Author: da-viper

lldb/test/API/lang/swift/stepping/TestSwiftStepping.py

@@ -24,6 +24,7 @@ class TestSwiftStepping(lldbtest.TestBase):
     mydir = lldbtest.TestBase.compute_mydir(__file__)
 
     @swiftTest
+    @skipIf(oslist=["linux"], archs=no_match("x86_64"))
     def test_swift_stepping(self):
         """Tests that we can step reliably in swift code."""
         self.build()