[llvm] [AMDGPU] Add writelane and readlane pseudos for SGPR spilling (PR #69923)

[Christudasan Devadasan via llvm-commits]

cdevadas wrote:

> What about naming them as SI_SPILL_S32_TO_VGPR and SI_RELOAD_S32_FROM_VGPR to better reflect what they are used for?

Done.

https://github.com/llvm/llvm-project/pull/69923