[clang] clang-sycl-linker: Compute the DataLayout from the triple (PR #224376)

[Alexey Bader via cfe-commits]

https://github.com/bader approved this pull request.

LGTM, in spite of removing the only real use of `TM`. We have changes downstream with more `TM` uses which we will upstream later.

@asudarsa account inactive for more than a year, so I suppose we don't need to wait for @asudarsa review.

https://github.com/llvm/llvm-project/pull/224376