[llvm] [msan] Eliminate non-deterministic behavior in the pass (PR #89831)

[Florian Mayer via llvm-commits]

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@@ -1464,19 +1465,20 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
   }
 
   void materializeChecks() {
-    llvm::stable_sort(InstrumentationList,
-                      [](const ShadowOriginAndInsertPoint &L,
-                         const ShadowOriginAndInsertPoint &R) {
-                        return L.OrigIns < R.OrigIns;
-                      });
+#ifndef NDEBUG
+    SmallPtrSet<Instruction *, 16> Done;
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fmayer wrote:

comment that this is for the assert below only.

https://github.com/llvm/llvm-project/pull/89831