[llvm] [VPlan] Look through BCast when folding live-ins (PR #202527)

[Ramkumar Ramachandra via llvm-commits]

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artagnon wrote:

I mean we can always force the simplification if we really want (https://github.com/llvm/llvm-project/pull/208852) -- I was looking for something elegant using ConstantFolder/InstSimplifyFolder, but it seems that this is the best we can do.

https://github.com/llvm/llvm-project/pull/202527