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

[via llvm-commits]

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@@ -1259,27 +1275,22 @@ class Allocator {
     storeEndMarker(RoundNewPtr, NewSize, BlockEnd);
   }
 
-  StackDepot *getDepotIfEnabled(const Options &Options) {
-    if (!UNLIKELY(Options.get(OptionBit::TrackAllocationStacks)))
-      return nullptr;
-    return Depot;
-  }
-
   void storePrimaryAllocationStackMaybe(const Options &Options, void *Ptr) {
-    auto *Depot = getDepotIfEnabled(Options);
-    if (!Depot)
+    auto *RingBuffer = getRingBufferIfEnabled(Options);
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ChiaHungDuan wrote:

Please spell the type

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