[llvm] [AMDGPU][SROA] Expand cast chain handling to floating point types (PR #228113)

[Steffen Larsen via llvm-commits]

steffenlarsen wrote:

The checks are relaxed quite a lot with this. Are there other types this could let through a non-bitcast cast-chain? I suspect the casts would be valid, but it would be good to test more in that case.

https://github.com/llvm/llvm-project/pull/228113