[llvm] [PreISelIntrinsicLowering] Lower bounded memcpy/memmove to masked load/store (PR #212710)

[via llvm-commits]

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Harishankar14 wrote:

@arsenm its nothing but the vectorization thingy !!
really just the number of lanes in the mask
defined as `PowerOf2Ceil(MaxLen)`

i can document it, thanks for the mention !! 

https://github.com/llvm/llvm-project/pull/212710