[clang] [clang] Remove #undef alloca (PR #81534)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Arthur Eubanks (aeubanks)

<details>
<summary>Changes</summary>

Added in 26670dcba1609574cba5942aff78ff97b567c5f3.

---
Full diff: https://github.com/llvm/llvm-project/pull/81534.diff


1 Files Affected:

- (modified) clang/include/clang/Basic/Builtins.h (-4) 


``````````diff
diff --git a/clang/include/clang/Basic/Builtins.h b/clang/include/clang/Basic/Builtins.h
index f955d21169556a..6700d1903a0088 100644
--- a/clang/include/clang/Basic/Builtins.h
+++ b/clang/include/clang/Basic/Builtins.h
@@ -20,10 +20,6 @@
 #include "llvm/ADT/StringRef.h"
 #include <cstring>
 
-// VC++ defines 'alloca' as an object-like macro, which interferes with our
-// builtins.
-#undef alloca
-
 namespace clang {
 class TargetInfo;
 class IdentifierTable;

``````````

</details>


https://github.com/llvm/llvm-project/pull/81534