Unifies the name-lookup mechanisms used in various parts of the AST
and separates lexical name lookup from qualified name lookup. In
particular:
  * Make DeclContext the central data structure for storing and
    looking up declarations within existing declarations, e.g., members
    of structs/unions/classes, enumerators in C++0x enums, members of
    C++ namespaces, and (later) members of Objective-C
    interfaces/implementations. DeclContext uses a lazily-constructed
    data structure optimized for fast lookup (array for small contexts,
    hash table for larger contexts). 

  * Implement C++ qualified name lookup in terms of lookup into
    DeclContext.

  * Implement C++ unqualified name lookup in terms of
    qualified+unqualified name lookup (since unqualified lookup is not
    purely lexical in C++!)

  * Limit the use of the chains of declarations stored in
    IdentifierInfo to those names declared lexically.

  * Eliminate CXXFieldDecl, collapsing its behavior into
    FieldDecl. (FieldDecl is now a ScopedDecl).

  * Make RecordDecl into a DeclContext and eliminates its
    Members/NumMembers fields (since one can just iterate through the
    DeclContext to get the fields).



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60878 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/PrintParserCallbacks.cpp b/Driver/PrintParserCallbacks.cpp
index f3ddb23..8ec45f2 100644
--- a/Driver/PrintParserCallbacks.cpp
+++ b/Driver/PrintParserCallbacks.cpp
@@ -185,13 +185,14 @@
   
     /// Act on @defs() element found when parsing a structure.  ClassName is the
     /// name of the referenced class.   
-    virtual void ActOnDefs(Scope *S, SourceLocation DeclStart,
+    virtual void ActOnDefs(Scope *S, DeclTy *TagD, SourceLocation DeclStart,
                            IdentifierInfo *ClassName,
                            llvm::SmallVectorImpl<DeclTy*> &Decls) {
       llvm::cout << __FUNCTION__ << "\n";
     }
 
-    virtual DeclTy *ActOnField(Scope *S, SourceLocation DeclStart,
+    virtual DeclTy *ActOnField(Scope *S, DeclTy *TagD, 
+                               SourceLocation DeclStart,
                                Declarator &D, ExprTy *BitfieldWidth) {
       llvm::cout << __FUNCTION__ << "\n";
       return 0;