[llvm] [AsmPrinter][Dwarf5][nfc] Remove template from AccelTable class (PR #76296)

[David Blaikie via llvm-commits]

dwblaikie wrote:

> Recently, these different implementations were combined by using a std::variant.

@ayermolo for posterity, could you explain/point to an existing explanation for that? (Sorry, I know I reviewed the code, but it's a lot to try to page back in, etc - perhaps we talked about it already elsewhere so a pointer to taht discussion would be good if we had one)

https://github.com/llvm/llvm-project/pull/76296