[hip] Remove the coercion on aggregate kernel arguments.

- If an aggregate argument is indirectly accessed within kernels, direct
  passing results in unpromotable `alloca`, which degrade performance
  significantly. InferAddrSpace pass is enhanced in
  [D91121](https://reviews.llvm.org/D91121) to take the assumption that
  generic pointers loaded from the constant memory could be regarded
  global ones. The need for the coercion on aggregate arguments is
  mitigated.

Differential Revision: https://reviews.llvm.org/D89980