[llvm] [ADT] Add implementations for avgFloor and avgCeil to APInt (PR #84431)

[Simon Pilgrim via llvm-commits]

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@@ -14,6 +14,7 @@
 #include "llvm/Support/Alignment.h"
 #include "gtest/gtest.h"
 #include <array>
+#include <limits.h>
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RKSimon wrote:

```#include <climits>```

https://github.com/llvm/llvm-project/pull/84431