Fix tests not to emit IR output

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58729 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Transforms/MergeFunc/phi-speculation2.ll b/test/Transforms/MergeFunc/phi-speculation2.ll
index 1649100..d8c6e30 100644
--- a/test/Transforms/MergeFunc/phi-speculation2.ll
+++ b/test/Transforms/MergeFunc/phi-speculation2.ll
@@ -1,4 +1,4 @@
-; RUN: llvm-as < %s | opt -mergefunc -stats |& grep {functions merged}
+; RUN: llvm-as < %s | opt -mergefunc -stats -disable-output |& grep {functions merged}
 
 define i32 @foo1(i32 %x) {
 entry: