C++: fix auto completion for template parameters

Fix auto completion for the case when template parameter should be
found somewhere of scope of template instantiation declaration.
Example:
struct A
{
    void foo();
    struct B
    {
        int b;
    };
};

template<typename T>
struct Template
{
    T* get() { return 0; }
    T t;
};

void A::foo()
{
    Template<B> templ;
    templ.get()->//no autocompletion
    templ.t.//no autocompletion
}

Task-number: QTCREATORBUG-8852
Task-number: QTCREATORBUG-9169
Change-Id: I56b40776e66740f995ae6fc5d69e3c50139a3af2
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/libs/cplusplus/ResolveExpression.h

@@ -71,7 +71,7 @@ protected:
 
     void thisObject();
 
-    void addResult(const FullySpecifiedType &ty, Scope *scope);
+    void addResult(const FullySpecifiedType &ty, Scope *scope, ClassOrNamespace *binding = 0);
     void addResults(const QList<Symbol *> &symbols);
     void addResults(const QList<LookupItem> &items);
 
@@ -126,6 +126,10 @@ protected:
 
 
 private:
+    ClassOrNamespace *findClassForTemplateParameterInExpressionScope(
+            ClassOrNamespace *resultBinding,
+            const FullySpecifiedType &ty) const;
+
     Scope *_scope;
     const LookupContext& _context;
     Bind bind;