[clang] [lldb] [AST] Add OriginalDC argument to ExternalASTSource::FindExternalVisibleDeclsByName (PR #123152)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

@nikic hi, could you test if this patch may trigger the compilation time regression?

https://github.com/llvm/llvm-project/pull/123152