0c480dd4b6
Fixes a bug on AMDGPU targets where a pointer was stored as address space 5, but then loaded as address space 0. Issue found as part of [Kokkos](https://github.com/kokkos/kokkos) testing, specifically `hip.atomics` (see [core/unit_test/TestAtomics.hpp](https://github.com/kokkos/kokkos/blob/develop/core/unit_test/TestAtomics.hpp)). Issue was introduced by commit [39ec9de7c230](https://github.com/llvm/llvm-project/commit/39ec9de7c230) - [clang][CodeGen] sret args should always point to the alloca AS, so use that (https://github.com/llvm/llvm-project/pull/114062).