preprocessor: add some helper function to dump Environment state

Change-Id: I5e1d549f96e899aadd5c94a5d7ef7f3169f45806
Reviewed-by: hjk <qthjk@ovi.com>

src/libs/cplusplus/PreprocessorEnvironment.h

@@ -86,6 +86,7 @@ public:
     void addMacros(const QList<Macro> &macros);
 
     static bool isBuiltinMacro(const ByteArrayRef &name);
+    void dump() const;
 
 private:
     static unsigned hashCode(const QByteArray &s);