[libunwind] [libunwind] include alloca.h in test/aarch64_za_unwind.pass.cpp (PR #207376)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libunwind

Author: Shreeyash Pandey (bojle)

<details>
<summary>Changes</summary>

Glibc provides the alloca function as a part of stdlib.h when _GNU_SOURCE is declared (which is the case with standard linux builds). [1]

On non-glibc systems, this may not be the case (for example, picolibc). These libraries may not implicitly include alloca.h as a part of the standard lib.

[1] https://github.com/bminor/glibc/blob/04e750e75b73957cf1c791535a3f4319534a52fc/stdlib/stdlib.h#L728

---
Full diff: https://github.com/llvm/llvm-project/pull/207376.diff


1 Files Affected:

- (modified) libunwind/test/aarch64_za_unwind.pass.cpp (+1) 


``````````diff
diff --git a/libunwind/test/aarch64_za_unwind.pass.cpp b/libunwind/test/aarch64_za_unwind.pass.cpp
index 36536860c1a96..7de9089af75f7 100644
--- a/libunwind/test/aarch64_za_unwind.pass.cpp
+++ b/libunwind/test/aarch64_za_unwind.pass.cpp
@@ -13,6 +13,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <alloca.h>
 #include <string.h>
 #if defined(__APPLE__)
 #include <sys/sysctl.h>

``````````

</details>


https://github.com/llvm/llvm-project/pull/207376