[clang] [llvm] [AMDGPU] Extend readlane, writelane and readfirstlane intrinsic lowering for generic types (PR #89217)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Does this need IR autoupgrade?

This type of auto upgrade is free, it just happens 

https://github.com/llvm/llvm-project/pull/89217