[AMDGPU] Correctly determine the toolchain linker (#89803)

Summary:
The AMDGPU toolchain simply took the short name to get the link job
instead of using the common utilities that respect options like
`-fuse-ld`. Any linker that isn't `ld.lld` will fail, however we should
be able to override it.
GitOrigin-RevId: 62549dbbf286823e400e07cff5ae219e48c175d2
2 files changed