[SourceKit/CodeCompletion] Remove unnecessary sorting in completion

codeCompleteOpen() has own sorting algorithm, codeComplete() calls this
sortCompletionResults() in its callback. So this pre-sorting is
completely unnecessary.

Author: rintaro

tools/SourceKit/lib/SwiftLang/SwiftCompletion.cpp

@@ -100,7 +100,6 @@ struct SwiftCodeCompletionConsumer
 
   void handleResults(MutableArrayRef<CodeCompletionResult *> Results) override {
     assert(swiftContext.swiftASTContext);
-    CodeCompletionContext::sortCompletionResults(Results);
     handleResultsImpl(Results, swiftContext);
   }
 };