[llvm] [DataFlowSanitizer] Properly add ext attributes on arguments as needed. (PR #225443)

[Jonas Paulsson via llvm-commits]

JonPsson1 wrote:

> dfsan incorrectly using zext isn't a reason to expand the incorrect usage to more places. Using the wrong marking is likely to blow up (particularly on RISC-V). Please compute the attributes correctly.

done

https://github.com/llvm/llvm-project/pull/225443