[llvm] [AMDGPU] Hoist permlane64/readlane/readfirstlane through unary/binary operands (PR #129037)

[Pierre van Houtryve via llvm-commits]

Pierre-vh wrote:

I removed permlane handling for this patch except for the BitCastInst case which was already handled before

https://github.com/llvm/llvm-project/pull/129037