PR13811: Add a FunctionParmPackExpr node to handle references to function
parameter packs where the reference is not being expanded but the pack has
been. Previously, Clang would segfault in such cases.

llvm-svn: 163672
diff --git a/clang/lib/AST/ExprClassification.cpp b/clang/lib/AST/ExprClassification.cpp
index f16d70b..24ec6bb 100644
--- a/clang/lib/AST/ExprClassification.cpp
+++ b/clang/lib/AST/ExprClassification.cpp
@@ -134,6 +134,7 @@
     // ObjC instance variables are lvalues
     // FIXME: ObjC++0x might have different rules
   case Expr::ObjCIvarRefExprClass:
+  case Expr::FunctionParmPackExprClass:
     return Cl::CL_LValue;
 
     // C99 6.5.2.5p5 says that compound literals are lvalues.