[compiler-rt] [scudo] Fix stack depot validation. (PR #87024)

[via llvm-commits]

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@@ -112,7 +112,7 @@ class alignas(atomic_u64) StackDepot {
     if (TabMask == 0)
       return false;
     uptr TabSize = TabMask + 1;
-    if (!isPowerOfTwo(TabSize))
+    if (TabSize == 0 || !isPowerOfTwo(TabSize))
       return false;
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ChiaHungDuan wrote:

I'm wondering if we should fix `isPowerOfTwo` instead? Zero is not a power of 2.

https://github.com/llvm/llvm-project/pull/87024