C++: Fix highlighting for lines with predefined macros

This adds definitions for the macros __FILE__, __LINE__, __DATE__ and
__TIME__ on demand.

As a side effect, this also introduces highlighting for the uses of
these macros.

Task-number: QTCREATORBUG-8036
Change-Id: Ib7546c7d45d2eecbc50c7883fc684e3497154405
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/libs/cplusplus/Macro.h

@@ -137,6 +137,12 @@ public:
     void setVariadic(bool isVariadic)
     { f._variadic = isVariadic; }
 
+    bool isPredefined() const
+    { return f._predefined; }
+
+    void setPredefined(bool isPredefined)
+    { f._predefined = isPredefined; }
+
     QString toString() const;
     QString toStringWithLineBreaks() const;
 
@@ -151,6 +157,7 @@ private:
         unsigned _hidden: 1;
         unsigned _functionLike: 1;
         unsigned _variadic: 1;
+        unsigned _predefined: 1;
     };
 
     QByteArray _name;