C++: Type deduction for auto-declared variables implemented

Handled to major cases of 'auto' variable declaration:
1. auto var = someInitializer;
2. Q_FOREACH(auto item, collection) or foreach(auto item, collection)

In first case type deducted directly from initializer. If variable has no initializer then corresponded error reported. In second case type deducted from '*collection.begin()' expression.

Change-Id: Ie930add1648b99440281ae04d973fd6904bc9e46
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

src/libs/3rdparty/cplusplus/Symbols.h

@@ -104,9 +104,11 @@ public:
     virtual ~Declaration();
 
     void setType(const FullySpecifiedType &type);
+    void setInitializer(StringLiteral const* initializer);
 
     // Symbol's interface
     virtual FullySpecifiedType type() const;
+    const StringLiteral *getInitializer() const;
 
     virtual const Declaration *asDeclaration() const
     { return this; }
@@ -125,6 +127,7 @@ protected:
 
 private:
     FullySpecifiedType _type;
+    const StringLiteral *_initializer;
 };
 
 class CPLUSPLUS_EXPORT EnumeratorDeclaration: public Declaration