[clang] [Clang] Add selftest for macro __BPF_FEATURE_ATOMIC_MEM_ORDERING (PR #188675)

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https://github.com/yonghong-song created https://github.com/llvm/llvm-project/pull/188675

Add selftest for macro __BPF_FEATURE_ATOMIC_MEM_ORDERING as the pull request [1] missed the test.

  [1] https://github.com/llvm/llvm-project/pull/107343

>From 1723ef2d85e951b1c484f940dd8cf13b62b25066 Mon Sep 17 00:00:00 2001
From: Yonghong Song <yonghong.song at linux.dev>
Date: Wed, 25 Mar 2026 21:22:27 -0700
Subject: [PATCH] [Clang] Add selftest for macro
 __BPF_FEATURE_ATOMIC_MEM_ORDERING

Add selftest for macro __BPF_FEATURE_ATOMIC_MEM_ORDERING as
the pull request [1] missed the test.

  [1] https://github.com/llvm/llvm-project/pull/107343
---
 clang/test/Preprocessor/bpf-predefined-macros.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/clang/test/Preprocessor/bpf-predefined-macros.c b/clang/test/Preprocessor/bpf-predefined-macros.c
index a9ae8c58c3ba7..b4e37fdd7de37 100644
--- a/clang/test/Preprocessor/bpf-predefined-macros.c
+++ b/clang/test/Preprocessor/bpf-predefined-macros.c
@@ -73,6 +73,9 @@ int v;
 #ifdef __BPF_FEATURE_GOTOX
 int w;
 #endif
+#ifdef __BPF_FEATURE_ATOMIC_MEM_ORDERING
+int x;
+#endif
 
 // CHECK: int b;
 // CHECK: int c;
@@ -115,6 +118,11 @@ int w;
 // CPU_V4: int v;
 // CPU_V4: int w;
 
+// CPU_V1: int x;
+// CPU_V2: int x;
+// CPU_V3: int x;
+// CPU_V4: int x;
+
 // CPU_GENERIC: int g;
 
 // CPU_PROBE: int f;