[llvm] [AggressiveInstCombine] Guard memset with length in [0, 1] (PR #213240)

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hsnaveen2u wrote:

Hi @nikic 

I have set and verified navehs at qti.qualcomm.com as my public GitHub email and disabled email privacy. 
Could you please recheck?

Thanks

https://github.com/llvm/llvm-project/pull/213240