[compiler-rt] [asan][NFCI] Add ASAN_POISONING_H header guard (PR #133178)

[Thurston Dang via llvm-commits]

https://github.com/thurstond created https://github.com/llvm/llvm-project/pull/133178

None

>From 47f2d578223de01163ae8c75b54011d030366bd9 Mon Sep 17 00:00:00 2001
From: Thurston Dang <thurston at google.com>
Date: Wed, 26 Mar 2025 23:23:40 +0000
Subject: [PATCH] [asan][NFCI] Add ASAN_POISONING_H header guard

---
 compiler-rt/lib/asan/asan_poisoning.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/compiler-rt/lib/asan/asan_poisoning.h b/compiler-rt/lib/asan/asan_poisoning.h
index 600bd011f304c..b68af1086e17d 100644
--- a/compiler-rt/lib/asan/asan_poisoning.h
+++ b/compiler-rt/lib/asan/asan_poisoning.h
@@ -11,6 +11,9 @@
 // Shadow memory poisoning by ASan RTL and by user application.
 //===----------------------------------------------------------------------===//
 
+#ifndef ASAN_POISONING_H
+#define ASAN_POISONING_H
+
 #include "asan_interceptors.h"
 #include "asan_internal.h"
 #include "asan_mapping.h"
@@ -96,3 +99,5 @@ ALWAYS_INLINE void FastPoisonShadowPartialRightRedzone(
 void FlushUnneededASanShadowMemory(uptr p, uptr size);
 
 }  // namespace __asan
+
+#endif  // ASAN_POISONING_H