[clang] [Clang] Fix name lookup for dependent bases (PR #114978)

[Vladislav Belov via cfe-commits]

vbe-sc wrote:

@Endilll, please, could you take a look? 
Also, do you have any ideas why the Win pipeline fails with checkout failure? How can I fix it? 

https://github.com/llvm/llvm-project/pull/114978