mikaelholmen wrote:

Hello @fmayer !

If I compile this patch with UBSan (-DLLVM_USE_SANITIZER='Undefined') and run 
tests, I see the following for many many lit tests:
```
../include/llvm/Support/CommandLine.h:601:13: runtime error: load of value 2, 
which is not a valid value for type 'const RecordStackHistoryMode'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior 
../include/llvm/Support/CommandLine.h:601:13 in 
```
Can e.g. be seen with
```
llc -verify-machineinstrs -o - test/CodeGen/AArch64/ldst-unscaledimm.ll 
-mtriple=aarch64-linux-gnu
```
if you compiled llc with UBSan.

https://github.com/llvm/llvm-project/pull/86356
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