[lldb] Bump SWIG minimum version to 4

SWIG 4 was released in 2019 and has been the de-facto standard for a
while now. All bots are running SWIG 4.0 or later.

This was motivated by #64279 which discovered that 662548c broke the
LLDB build with SWIG 3 on Windows.

Differential revision: https://reviews.llvm.org/D156804

lldb/test/API/python_api/default-constructor/TestDefaultConstructorForAPIObjects.py

@@ -117,8 +117,6 @@ class APIDefaultConstructorTestCase(TestBase):
 
         sb_debugger.fuzz_obj(obj)
 
-    # darwin: This test passes with swig 3.0.2, fails w/3.0.5 other tests fail
-    # with 2.0.12 http://llvm.org/pr23488
     def test_SBError(self):
         obj = lldb.SBError()
         if self.TraceOn():
@@ -225,9 +223,6 @@ class APIDefaultConstructorTestCase(TestBase):
 
         sb_listener.fuzz_obj(obj)
 
-    # Py3 asserts due to a bug in SWIG.  Trying to upstream a patch to fix
-    # this in 3.0.8
-    @skipIf(py_version=[">=", (3, 0)], swig_version=["<", (3, 0, 8)])
     def test_SBModule(self):
         obj = lldb.SBModule()
         if self.TraceOn():

lldb/test/API/python_api/lldbutil/TestSwigVersion.py

@@ -21,6 +21,6 @@ class SwigVersionTestCase(TestBase):
         self.assertTrue(getattr(lldb, "swig_version"))
         self.assertIsInstance(lldb.swig_version, tuple)
         self.assertEqual(len(lldb.swig_version), 3)
-        self.assertGreaterEqual(lldb.swig_version[0], 1)
+        self.assertGreaterEqual(lldb.swig_version[0], 4)
         for v in lldb.swig_version:
             self.assertGreaterEqual(v, 0)

lldb/test/API/python_api/module_section/TestModuleAndSection.py

@@ -10,9 +10,6 @@ from lldbsuite.test.lldbutil import symbol_type_to_str
 
 
 class ModuleAndSectionAPIsTestCase(TestBase):
-    # Py3 asserts due to a bug in SWIG.  A fix for this was upstreamed into
-    # SWIG 3.0.8.
-    @skipIf(py_version=[">=", (3, 0)], swig_version=["<", (3, 0, 8)])
     def test_module_and_section(self):
         """Test module and section APIs."""
         self.build()

lldb/test/API/python_api/value/linked_list/TestValueAPILinkedList.py

@@ -20,9 +20,6 @@ class ValueAsLinkedListTestCase(TestBase):
         # Find the line number to break at.
         self.line = line_number("main.cpp", "// Break at this line")
 
-    # Py3 asserts due to a bug in SWIG.  A fix for this was upstreamed into
-    # SWIG 3.0.8.
-    @skipIf(py_version=[">=", (3, 0)], swig_version=["<", (3, 0, 8)])
     def test(self):
         """Exercise SBValue API linked_list_iter."""
         d = {"EXE": self.exe_name}