Track more macro uses.

In particular macros that are only checked for definition or are
expanded during the evaluation of an #if or #elif directive are now also
added to the list available through Document::macroUses().

The names of undefined macros that are interesting (because they're used
in an #ifdef or a defined(...)) are now available through
Document::undefinedMacroUses().

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

src/libs/cplusplus/FastPreprocessor.h

@@ -58,9 +58,13 @@ public:
 
     virtual void macroAdded(const Macro &) {}
 
+    virtual void passedMacroDefinitionCheck(unsigned, const Macro &) {}
+    virtual void failedMacroDefinitionCheck(unsigned, const QByteArray &) {}
+
     virtual void startExpandingMacro(unsigned,
                                      const Macro &,
                                      const QByteArray &,
+                                     bool,
                                      const QVector<MacroArgumentReference> &) {}
 
     virtual void stopExpandingMacro(unsigned, const Macro &) {}