Switch PPCallbacks to take the new MacroDefinition instead of MacroDirective*, in order to preserve full information on module macro expansion.

llvm-svn: 236404
diff --git a/clang/tools/libclang/Indexing.cpp b/clang/tools/libclang/Indexing.cpp
index 20df33e..0ede684 100644
--- a/clang/tools/libclang/Indexing.cpp
+++ b/clang/tools/libclang/Indexing.cpp
@@ -284,10 +284,10 @@
   /// MacroUndefined - This hook is called whenever a macro #undef is seen.
   /// MI is released immediately following this callback.
   void MacroUndefined(const Token &MacroNameTok,
-                      const MacroDirective *MD) override {}
+                      const MacroDefinition &MD) override {}
 
   /// MacroExpands - This is called by when a macro invocation is found.
-  void MacroExpands(const Token &MacroNameTok, const MacroDirective *MD,
+  void MacroExpands(const Token &MacroNameTok, const MacroDefinition &MD,
                     SourceRange Range, const MacroArgs *Args) override {}
 
   /// SourceRangeSkipped - This hook is called when a source range is skipped.