[LLDB] Skip random failing tests on Arm/AArch64 Linux bots

Following tests have been failing randomly on LLDB Arm and AArch64 Linux
builtbots:

TestMultilineNavigation.py
TestMultilineCompletion.py
TestIOHandlerCompletion.py
TestGuiBasic.py

I have increased allocated CPU resources to these bots but it has not
improved situation to an acceptable level. This patch marks them as
skipped on Arm/AArch64 for now.

Author: omjavaid

lldb/test/API/commands/expression/multiline-completion/TestMultilineCompletion.py

@@ -31,6 +31,7 @@ def exit_expression_editor(self):
     @skipIfAsan
     @skipIfEditlineSupportMissing
     @expectedFailureAll(oslist=['freebsd'], bugnumber='llvm.org/pr49408')
+    @skipIf(oslist=["linux"], archs=["arm", "aarch64"])
     def test_basic_completion(self):
         """Test that we can complete a simple multiline expression"""
         self.build()

lldb/test/API/commands/expression/multiline-navigation/TestMultilineNavigation.py

@@ -19,6 +19,7 @@ class TestCase(PExpectTest):
     @skipIfAsan
     @skipIfEditlineSupportMissing
     @expectedFailureAll(oslist=['freebsd'], bugnumber='llvm.org/pr48316')
+    @skipIf(oslist=["linux"], archs=["arm", "aarch64"])
     def test_nav_arrow_up(self):
         """Tests that we can navigate back to the previous line with the up arrow"""
         self.launch()

lldb/test/API/commands/gui/basic/TestGuiBasic.py

@@ -15,6 +15,7 @@ class BasicGuiCommandTest(PExpectTest):
     # under ASAN on a loaded machine..
     @skipIfAsan
     @skipIfCursesSupportMissing
+    @skipIf(oslist=["linux"], archs=["arm", "aarch64"])
     def test_gui(self):
         self.build()
 

lldb/test/API/iohandler/completion/TestIOHandlerCompletion.py

@@ -18,6 +18,7 @@ class IOHandlerCompletionTest(PExpectTest):
     @skipIfAsan
     @skipIfEditlineSupportMissing
     @expectedFailureAll(oslist=['freebsd'], bugnumber='llvm.org/pr49408')
+    @skipIf(oslist=["linux"], archs=["arm", "aarch64"])
     def test_completion(self):
         self.launch(dimensions=(100,500))