[llvm] [offload] support arbitrary memoryFill pattern sizes in L0 plugin (PR #209724)

[Łukasz Plewa via llvm-commits]

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lplewa wrote:

NIT: Theoretically if zeCommandListAppendMemoryCopy allows memory to overlap 
we could do something like memcpy(x+1, x, len -1).

Documentation do not say that it cannot... But it do not say that it can too. 
So this is something that would need investigation before implmenenting

https://github.com/llvm/llvm-project/pull/209724