[clang] [clang] Include <stddef.h> for size_t (PR #139496)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: Takuto Ikuta (atetubou)

<details>
<summary>Changes</summary>

This is to fix Clang module build in chromium.

---
Full diff: https://github.com/llvm/llvm-project/pull/139496.diff


1 Files Affected:

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


``````````diff
diff --git a/clang/lib/Headers/mm_malloc.h b/clang/lib/Headers/mm_malloc.h
index d32fe59416277..dec91fc3f720a 100644
--- a/clang/lib/Headers/mm_malloc.h
+++ b/clang/lib/Headers/mm_malloc.h
@@ -15,6 +15,8 @@
 #ifdef _WIN32
 #include <malloc.h>
 #else
+#include <stddef.h>
+
 #ifndef __cplusplus
 extern int posix_memalign(void **__memptr, size_t __alignment, size_t __size);
 #else

``````````

</details>


https://github.com/llvm/llvm-project/pull/139496