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

[Vikram Hegde via cfe-commits]

vikramRH wrote:

> > add f32 pattern to select read/writelane operations
> 
> Why would you need this? Don't you legalize f32 to i32?

Sorry about this. Its a leftover comment from the initial implementation which I should have removed.

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