[llvm] [LV][EVL] Support cast instruction with EVL-vectorization (PR #108351)

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LiqinWeng wrote:

> Same question as for #109614, would using a generic intrinsic recipe work, or is there a need to have dedicated recipes for those?
Are there any relevant job assignments for vectorization that I could participate in? I really want to participate. The main concern is spending a lot of time doing repetitive tasks~~~ :)

https://github.com/llvm/llvm-project/pull/108351