[clang] [clang] Disable type-aware allocator lookup for older C++ versions (PR #213430)

[via cfe-commits]

nots1dd wrote:

Hm I think we need to simply modify the compilation command for `microsoft-vector-deleting-dtors2` test with `-std=c++26` and it should work. (if that is a permissible change)

as for the pch test I need to do more digging (not sure why it was passing on my system even after applying the patch it was a fresh build)

https://github.com/llvm/llvm-project/pull/213430