Remove unused diagnostic.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176774 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index 2161892..c7cd205 100644
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -1644,8 +1644,6 @@
   "attribute takes at least %0 argument%s0">;
 def err_attribute_missing_parameter_name : Error<
   "attribute requires unquoted parameter">;
-def err_attribute_requires_type_parameter : Error<
-  "%0 attribute requires type parameter">;
 def err_attribute_invalid_vector_type : Error<"invalid vector element type %0">;
 def err_attribute_bad_neon_vector_size : Error<
   "Neon vector size must be 64 or 128 bits">;