[clang] [clang] Add size filter for stack auto init (PR #74777)

[Vitaly Buka via cfe-commits]

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@@ -1205,10 +1205,19 @@ static void emitStoresForConstant(CodeGenModule &CGM, const VarDecl &D,
   }
 
   auto *SizeVal = llvm::ConstantInt::get(CGM.IntPtrTy, ConstantSize);
+  auto trivialAutoVarInitMaxSize =
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vitalybuka wrote:

would it be simpler 

```
 if (IsAutoInit && sizeVal->getValue().sgt(trivialAutoVarInitMaxSize)) 
    return;
```

https://github.com/llvm/llvm-project/pull/74777