Fix the address of a label to be properly considered and emitted as a
constant.

llvm-svn: 62948
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 4c24205..76bdaa2 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -215,6 +215,8 @@
   APValue VisitUnaryOperator(const UnaryOperator *E);
   APValue VisitObjCStringLiteral(ObjCStringLiteral *E)
       { return APValue(E, 0); }
+  APValue VisitAddrLabelExpr(AddrLabelExpr *E)
+      { return APValue(E, 0); }
   APValue VisitConditionalOperator(ConditionalOperator *E);
 };
 } // end anonymous namespace