[clang] [lld] [llvm] [mlir] [IR] Introduce `T<address space>` to `DataLayout` to represent flat address space if a target supports it (PR #108786)

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gonzalobg wrote:

Another example for PTX targets is `.generic`, `.shared::cluster`, and `.shared::cta`, where `.generic` covers `.shared::cluster` which covers `.shared::cta`.

https://github.com/llvm/llvm-project/pull/108786