Consider GNU attributes when doing ambiguity resolution.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@57108 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaCXX/decl-expr-ambiguity.cpp b/test/SemaCXX/decl-expr-ambiguity.cpp
index b9e824d..48e1320 100644
--- a/test/SemaCXX/decl-expr-ambiguity.cpp
+++ b/test/SemaCXX/decl-expr-ambiguity.cpp
@@ -17,4 +17,5 @@
   T(d)[5]; // expected-warning {{statement was disambiguated as declaration}} expected-error {{redefinition of 'd'}}
   typeof(int[])(f) = { 1, 2 }; // expected-warning {{statement was disambiguated as declaration}}
   void(b)(int);
+  int(d2) __attribute__(()); // expected-warning {{statement was disambiguated as declaration}}
 }