Don't feed standard error to FileCheck.

This is an attempt to fix the buildbot that started failing after
r270808.

http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fast/builds/13141

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@270817 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit c642dab5e7f1cb2fe23bb12c8bdab2a5d5b7de5a)
diff --git a/test/SemaObjC/property-atomic-bool.m b/test/SemaObjC/property-atomic-bool.m
index 20bb607..4110b5e 100644
--- a/test/SemaObjC/property-atomic-bool.m
+++ b/test/SemaObjC/property-atomic-bool.m
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple x86_64-apple-macosx10.10 -ast-dump "%s" 2>&1 | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-apple-macosx10.10 -ast-dump "%s" | FileCheck %s
 
 // CHECK: TypedefDecl {{.*}} referenced AtomicBool '_Atomic(_Bool)'
 // CHECK:  AtomicType {{.*}} '_Atomic(_Bool)'