Update to new resolution for DR1458. When taking the address of an object of
incomplete class type which has an overloaded operator&, it's now just
unspecified whether the overloaded operator or the builtin is used.

llvm-svn: 150234
diff --git a/clang/test/CXX/expr/expr.const/p2-0x.cpp b/clang/test/CXX/expr/expr.const/p2-0x.cpp
index 43d683a..2d4f4fb 100644
--- a/clang/test/CXX/expr/expr.const/p2-0x.cpp
+++ b/clang/test/CXX/expr/expr.const/p2-0x.cpp
@@ -111,9 +111,10 @@
 
 // DR1458: taking the address of an object of incomplete class type
 namespace IncompleteClassTypeAddr {
-  struct S; // expected-note {{forward}}
+  struct S;
   extern S s;
-  constexpr S *p = &s; // expected-error {{constant expression}} expected-note {{cannot take address of object of incomplete class type 'IncompleteClassTypeAddr::S' in a constant expression}}
+  constexpr S *p = &s; // ok
+  static_assert(p, "");
 
   extern S sArr[];
   constexpr S (*p2)[] = &sArr; // ok
@@ -121,7 +122,7 @@
   struct S {
     constexpr S *operator&() { return nullptr; }
   };
-  constexpr S *q = &s;
+  constexpr S *q = &s; // ok
   static_assert(!q, "");
 }