Clang: Fix cursor position after completion of overloads

struct Foo {
    void begin();
    void begin() const;
};

void c(Foo &foo)
{
    foo.beg // complete to foo.begin()| instead of foo.begin(|)
}

Task-number: QTCREATORBUG-17443
Change-Id: I60ca16bbfeeb75c5c37a0d5bc6f46e9e9913b86e
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/plugins/clangcodemodel/clangcompletionassistprocessor.cpp

@@ -89,7 +89,8 @@ QList<AssistProposalItemInterface *> toAssistProposalItems(const CodeCompletions
 
         ClangAssistProposalItem *item = items.value(name, 0);
         if (item) {
-            item->addOverload(codeCompletion);
+            if (codeCompletion.hasParameters())
+                item->setHasOverloadsWithParameters(true);
         } else {
             item = new ClangAssistProposalItem;
             items.insert(name, item);