[clang] Reland "Reland [Modules] Remove unnecessary check when generating name lookup table in ASTWriter" (PR #139253)

[Viktoriia Bakalova via cfe-commits]

VitaNuo wrote:

Added the test case from https://github.com/llvm/llvm-project/issues/61065 as well as our internal one.

@ilya-biryukov We believe this PR should be safe to re-land. PTAL.



https://github.com/llvm/llvm-project/pull/139253