[compiler-rt] [NFC] Make RingBuffer an atomic pointer (PR #82547)

[via llvm-commits]

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@@ -1544,42 +1557,46 @@ class Allocator {
     u32 RingSize = static_cast<u32>(TabSize * kFramesPerStack);
     DCHECK(isPowerOfTwo(RingSize));
 
-    StackDepotSize = sizeof(StackDepot) + sizeof(atomic_u64) * RingSize +
-                     sizeof(atomic_u32) * TabSize;
+    auto StackDepotSize = sizeof(StackDepot) + sizeof(atomic_u64) * RingSize +
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ChiaHungDuan wrote:

Please spell the type

https://github.com/llvm/llvm-project/pull/82547