[clang] Introduce paged vector (PR #66430)

[Jakub Kuderski via cfe-commits]

kuhar wrote:

@vvereschaka I submitted a fix for death tests in https://github.com/llvm/llvm-project/commit/8580010672e9ff37b0744927296ca00dbcbef5be

https://github.com/llvm/llvm-project/pull/66430