[clang] [clang][nfc] Fix tests to avoid writing output to unreachable location, which might cause them to fail (PR #158698)

[Vy Nguyen via cfe-commits]

https://github.com/oontvoo updated https://github.com/llvm/llvm-project/pull/158698

>From f64b31960be277ba2633273c1f81d34d408ed852 Mon Sep 17 00:00:00 2001
From: Vy Nguyen <vyng at google.com>
Date: Mon, 15 Sep 2025 13:43:12 -0400
Subject: [PATCH] [clang][nfc] Fix tests to avoid writing output to unreachable
 location that might cause tests to fail.

---
 clang/test/Driver/clang_f_opts.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/clang/test/Driver/clang_f_opts.c b/clang/test/Driver/clang_f_opts.c
index eb3994ddabcd3..581b031eb7a86 100644
--- a/clang/test/Driver/clang_f_opts.c
+++ b/clang/test/Driver/clang_f_opts.c
@@ -55,8 +55,8 @@
 // RUN: %clang -### -S -fexperimental-loop-fusion %s 2>&1 | FileCheck -check-prefix=CHECK-FUSE-LOOPS %s
 // CHECK-FUSE-LOOPS: "-fexperimental-loop-fusion"
 //
-// RUN: %clang -c -fexperimental-loop-fusion -mllvm -print-pipeline-passes -O3 %s 2>&1 | FileCheck --check-prefixes=LOOP-FUSION-ON %s
-// RUN: %clang -c -mllvm -print-pipeline-passes -O3 %s 2>&1 | FileCheck --check-prefixes=LOOP-FUSION-OFF %s
+// RUN: %clang -c -fexperimental-loop-fusion -mllvm -print-pipeline-passes -O3 %s -o /dev/null 2>&1 | FileCheck --check-prefixes=LOOP-FUSION-ON %s
+// RUN: %clang -c -mllvm -print-pipeline-passes -O3 %s -o /dev/null 2>&1 | FileCheck --check-prefixes=LOOP-FUSION-OFF %s
 
 // LOOP-FUSION-ON: loop-fusion
 // LOOP-FUSION-OFF-NOT: loop-fusion