[llvm] AMDGPU/GlobalISel: Switch to extended LLTs (PR #196522)

[Petar Avramovic via llvm-commits]

petar-avramovic wrote:

> > We could go with much smaller patch, just enable extended LLTs and disable ~600 tests. good number will still pass - the ones that don't do any combines/lowering.
> 
> Yes, I'm on board with that.

Version without cpp changes https://github.com/llvm/llvm-project/pull/207419

https://github.com/llvm/llvm-project/pull/196522