[clang] [llvm] [LLVM][DWARF] Fix accelerator table switching between CU and TU (PR #77511)

[David Blaikie via cfe-commits]

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

Looks OK but please skip the extra assert-only `CurrentKind` variable in favor of testing the `CurrentDebugNames` value.

https://github.com/llvm/llvm-project/pull/77511