Support UnresolvedLookupExpr for PCH.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@106832 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/AST/ExprCXX.h b/include/clang/AST/ExprCXX.h
index 48248d3..d9058ac 100644
--- a/include/clang/AST/ExprCXX.h
+++ b/include/clang/AST/ExprCXX.h
@@ -1497,6 +1497,11 @@
       RequiresADL(RequiresADL), Overloaded(Overloaded), NamingClass(NamingClass)
   {}
 
+  UnresolvedLookupExpr(EmptyShell Empty)
+    : OverloadExpr(UnresolvedLookupExprClass, Empty),
+      RequiresADL(false), Overloaded(false), NamingClass(0)
+  {}
+
 public:
   static UnresolvedLookupExpr *Create(ASTContext &C,
                                       bool Dependent,
@@ -1528,17 +1533,23 @@
                                       UnresolvedSetIterator Begin, 
                                       UnresolvedSetIterator End);
 
+  static UnresolvedLookupExpr *CreateEmpty(ASTContext &C,
+                                           unsigned NumTemplateArgs);
+
   /// True if this declaration should be extended by
   /// argument-dependent lookup.
   bool requiresADL() const { return RequiresADL; }
+  void setRequiresADL(bool V) { RequiresADL = V; }
 
   /// True if this lookup is overloaded.
   bool isOverloaded() const { return Overloaded; }
+  void setOverloaded(bool V) { Overloaded = V; }
 
   /// Gets the 'naming class' (in the sense of C++0x
   /// [class.access.base]p5) of the lookup.  This is the scope
   /// that was looked in to find these results.
   CXXRecordDecl *getNamingClass() const { return NamingClass; }
+  void setNamingClass(CXXRecordDecl *D) { NamingClass = D; }
 
   // Note that, inconsistently with the explicit-template-argument AST
   // nodes, users are *forbidden* from calling these methods on objects
diff --git a/include/clang/Frontend/PCHBitCodes.h b/include/clang/Frontend/PCHBitCodes.h
index eda0fa1..fb7da77 100644
--- a/include/clang/Frontend/PCHBitCodes.h
+++ b/include/clang/Frontend/PCHBitCodes.h
@@ -771,7 +771,8 @@
       
       EXPR_CXX_DEPENDENT_SCOPE_MEMBER, // CXXDependentScopeMemberExpr
       EXPR_CXX_UNRESOLVED_CONSTRUCT, // CXXUnresolvedConstructExpr
-      EXPR_CXX_UNRESOLVED_MEMBER     // UnresolvedMemberExpr
+      EXPR_CXX_UNRESOLVED_MEMBER,    // UnresolvedMemberExpr
+      EXPR_CXX_UNRESOLVED_LOOKUP     // UnresolvedLookupExpr
     };
 
     /// \brief The kinds of designators that can occur in a