[llvm] [X86] Truncates i64 add arithmetic to i32 when known zeroes in upper 33 bits (PR #191619)

[Takashi Idobe via llvm-commits]

Takashiidobe wrote:

Looks good to me. I don't have any permissions on this project so I can't approve or do anything else but you can consider my feedback taken care of :+1: 

https://github.com/llvm/llvm-project/pull/191619