[clang] [libc] Fix wrapper headers for `at_quick_exit` on GLIBC for c++11 (PR #166960)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: Dominik Adamski (DominikAdamski)

<details>
<summary>Changes</summary>

Eliminate compilation error related to missing exception specification 'noexcept(true)' for at_quick_exit function in C++11.

---
Full diff: https://github.com/llvm/llvm-project/pull/166960.diff


1 Files Affected:

- (modified) clang/lib/Headers/llvm_libc_wrappers/stdlib.h (+2-2) 


``````````diff
diff --git a/clang/lib/Headers/llvm_libc_wrappers/stdlib.h b/clang/lib/Headers/llvm_libc_wrappers/stdlib.h
index 1da22abd0bc48..d79e7fa041ad4 100644
--- a/clang/lib/Headers/llvm_libc_wrappers/stdlib.h
+++ b/clang/lib/Headers/llvm_libc_wrappers/stdlib.h
@@ -34,13 +34,13 @@ _Static_assert(__builtin_offsetof(div_t, quot) == 0, "ABI mismatch!");
 _Static_assert(__builtin_offsetof(ldiv_t, quot) == 0, "ABI mismatch!");
 _Static_assert(__builtin_offsetof(lldiv_t, quot) == 0, "ABI mismatch!");
 
-#if defined(__GLIBC__) && __cplusplus >= 201703L
+#if defined(__GLIBC__) && __cplusplus >= 201103L
 #define at_quick_exit atexit
 #endif
 
 #include <llvm-libc-decls/stdlib.h>
 
-#if defined(__GLIBC__) && __cplusplus >= 201703L
+#if defined(__GLIBC__) && __cplusplus >= 201103L
 #undef at_quick_exit
 #endif
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/166960