[MLIR] Switch the ABI to use bare pointers and not memrefs (#1630)
[MLIR] Switch the ABI to use bare pointers and not memrefs (#1630)

This is a companion PR to
https://github.com/ROCmSoftwarePlatform/llvm-project-mlir/pull/690 and
should not be merged until that lands.

These changes will need to be revisited if the MLIR solver ever
supports dynamic shapes.
ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen