Revert "C++: Fix highlighting for lines with predefined macros"

This takes too much memory. For qtcreator.pro the numbers are as
follows:

    Patch applied:  ~ 1600MB (RES)
    Patch reverted: ~  510MB (RES)

This reverts commit 4c2daa90ce.

Task-number: QTCREATORBUG-10973
Change-Id: I843bd7c1ea4a26a1ec55ddc14c2a34a98d040922
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Robert Loehning <robert.loehning@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/libs/cplusplus/Macro.h

@@ -137,12 +137,6 @@ 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;
 
@@ -157,7 +151,6 @@ private:
         unsigned _hidden: 1;
         unsigned _functionLike: 1;
         unsigned _variadic: 1;
-        unsigned _predefined: 1;
     };
 
     QByteArray _name;