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

[Alexander Yermolovich via cfe-commits]

ayermolo wrote:

> Could this be caused by the patch https://lab.llvm.org/buildbot/#/builders/236/builds/8673 ?

Passes for me locally. Also patch impacts .debug_names for DWARF. So highly unlikely it would cause this test to fail.

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