add interface for walking macro table.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63925 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PPLexerChange.cpp b/lib/Lex/PPLexerChange.cpp
index 3e02fbd..244281f 100644
--- a/lib/Lex/PPLexerChange.cpp
+++ b/lib/Lex/PPLexerChange.cpp
@@ -238,11 +238,9 @@
   // This is the end of the top-level file.  If the diag::pp_macro_not_used
   // diagnostic is enabled, look for macros that have not been used.
   if (Diags.getDiagnosticLevel(diag::pp_macro_not_used) != Diagnostic::Ignored){
-    for (llvm::DenseMap<IdentifierInfo*, MacroInfo*>::iterator I =
-         Macros.begin(), E = Macros.end(); I != E; ++I) {
+    for (macro_iterator I = macro_begin(), E = macro_end(); I != E; ++I)
       if (!I->second->isUsed())
         Diag(I->second->getDefinitionLoc(), diag::pp_macro_not_used);
-    }
   }
   return true;
 }