Revert "disable completions by default because they are crashy (#87)"

This reverts commit ee0aeeb.

Author: Marc Rasi

swift_kernel.py

@@ -214,9 +214,7 @@ def _init_swift(self):
         # SBTarget.CompleteCode API.
         # The user can disable/enable using "%disableCompletion" and
         # "%enableCompletion".
-        # TODO: Reenable completions when they become less crashy.
-        #self.completion_enabled = hasattr(self.target, 'CompleteCode')
-        self.completion_enabled = False
+        self.completion_enabled = hasattr(self.target, 'CompleteCode')
 
     def _init_repl_process(self):
         self.debugger = lldb.SBDebugger.Create()

test/tests/kernel_tests.py

@@ -203,7 +203,6 @@ def test_async_stdout(self):
             if msg['msg_type'] == 'status':
                 break
 
-    @unittest.skip  # TODO: Reenable.
     def test_swift_completion(self):
         reply, output_msgs = self.execute_helper(code="""
             func aFunctionToComplete() {}