Override getSRetAddrSpace() so that sret pointers for non-trivially- copyable types use the generic address space (addrspace 4), matching the "this" pointer convention on spirv64-amd-amdhsa.
Override getSRetAddrSpace() so that sret pointers for non-trivially- copyable types use the generic address space (addrspace 4), matching the "this" pointer convention on spirv64-amd-amdhsa.