[llvm] [RFC][AMDGPU] Remove old llvm.amdgcn.buffer.* and tbuffer intrinsics (PR #93801)

[Krzysztof Drewniak via llvm-commits]

krzysz00 wrote:

@jayfoad MLIR does not meaningfully depend on those intrinsics.

No current lowering uses the wrappers we have around those intrinsics.

Those wrappers are defined at https://github.com/llvm/llvm-project/blob/main/mlir/include/mlir/Dialect/LLVMIR/ROCDLOps.td#L428-L464 and are the same sort of "legacy infrastructure, do not use" as the intrinsics you're planning to remove in this PR.

You should be able to just delete the highlighted bit and any code that tries to refer to those (mainly their parsers and printers over in `mlir/lib/Dialect/LLVMIR/IR/ROCDLDialect.cpp` and the tests for the translation of those operations.

Also, re the migration, I'd suggest people might wart to move to the `raw.ptr.*` versions, since they're the newest and best-behaved ones.

https://github.com/llvm/llvm-project/pull/93801