[lldb] Handle suspend resume partial functions in TestSwiftStepInAsync (#2846)

(cherry picked from commit a8faa34)

Author: kastiglione

lldb/test/API/lang/swift/async/stepping/step-in/TestSwiftStepInAsync.py

@@ -54,7 +54,10 @@ def test(self):
                         process.Continue()
                     continue
 
-                self.assertEqual(caller_after, caller_before)
+                # The entry function is missing this prefix dedicating resume functions.
+                prefix = re.compile(r'^\([0-9]+\) (await|suspend) resume partial function for ')
+                self.assertEqual(prefix.sub('', caller_after),
+                                 prefix.sub('', caller_before))
                 num_async_steps += 1
 
         self.assertGreater(num_async_steps, 0)