locdesc: GPUs need this to support any location kind

[amd-shahab]

005-locations-on-stack.md:

> 3. `DW_OP_form_tls_address`... [moved from Section 2.5.1.3]

[ccoutant]

Let's save this for a follow-up proposal. This is, I believe, as written in the original LLVM proposal.

[t-tye]

I had thought we had changed DW_OP_form_tls_address to just be any location kind. But apparently we just let if support any address space within a memory location.