lldb: xfail TestCrossDSOTailCalls.py and TestCrossObjectTailCalls.py on arm/aarch64

This effectively reverts commit
8d2f252, which went a bit too far and
disabled these on all non-Darwin systems.

Author: vedantk

lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_dso/TestCrossDSOTailCalls.py

@@ -17,7 +17,8 @@ def setUp(self):
 
     @skipIf(compiler="clang", compiler_version=['<', '8.0'])
     @skipIf(dwarf_version=['<', '4'])
-    @skipUnlessDarwin # llvm.org/PR44561
+    @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr26265")
+    @expectedFailureAll(archs=['arm', 'aarch64'], bugnumber="llvm.org/PR44561")
     def test_cross_dso_tail_calls(self):
         self.build()
         exe = self.getBuildArtifact("a.out")

lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/cross_object/TestCrossObjectTailCalls.py

@@ -17,7 +17,8 @@ def setUp(self):
 
     @skipIf(compiler="clang", compiler_version=['<', '8.0'])
     @skipIf(dwarf_version=['<', '4'])
-    @skipUnlessDarwin # llvm.org/PR44561
+    @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr26265")
+    @expectedFailureAll(archs=['arm', 'aarch64'], bugnumber="llvm.org/PR44561")
     def test_cross_object_tail_calls(self):
         self.build()
         exe = self.getBuildArtifact("a.out")