hopefully fix a bunch of ARM buildbot failures

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@156513 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/incomplete-function-type.c b/test/CodeGen/incomplete-function-type.c
index 0ba6633..b630947 100644
--- a/test/CodeGen/incomplete-function-type.c
+++ b/test/CodeGen/incomplete-function-type.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -emit-llvm -o - %s | FileCheck %s
 // CHECK: ModuleID
 // CHECK-NOT: opaque
 // CHECK: define void @f0