[llvm] [Sanitizers] Don't inline unpoisoning of small stacks when inlining disabled (PR #75555)

[Mariusz Borsa via llvm-commits]

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@@ -3505,7 +3505,7 @@ void FunctionStackPoisoner::processStaticAllocas() {
       SplitBlockAndInsertIfThenElse(Cmp, Ret, &ThenTerm, &ElseTerm);
 
       IRBuilder<> IRBPoison(ThenTerm);
-      if (StackMallocIdx <= 4) {
+      if (ASan.MaxInlinePoisoningSize != 0 && StackMallocIdx <= 4) {
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wrotki wrote:

Not sure if I understand - minimum ClassSize is going to be 64 (kMinStackMallocSize << StackMallocIdx), L.Granularity = 8 , so if ASan.MaxInlinePoisoningSize == 0, the whole condition will be true, so inlining will happen. ASan.MaxInlinePoisoningSize == 0 should guarantee not inlining. So I'd rather keep it explicitly the way I had it, unless I misunderstood your suggestion?

https://github.com/llvm/llvm-project/pull/75555