Specify temporary file for -emit-llvm output in test case so that we don't deposit the file
in the original source directory.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@101402 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGenCXX/reference-in-blocks.cpp b/test/CodeGenCXX/reference-in-blocks.cpp
index ef09e43..c020bab 100644
--- a/test/CodeGenCXX/reference-in-blocks.cpp
+++ b/test/CodeGenCXX/reference-in-blocks.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fblocks %s -emit-llvm 
+// RUN: %clang_cc1 -fblocks %s -emit-llvm -o %t
 
 extern "C" int printf(const char*, ...);