[clang] Introduce paged vector (PR #66430)

[David Blaikie via cfe-commits]

dwblaikie wrote:

Oh, no worries at all. LLVM 's still figuring out this whole GitHub transition anyway. I mention it only for future reference and because it might help reviewers/you if comments are getting missplaced/there's trouble tracking unaddressed feedback, etc.

Thanks for sticking with this! I know it's a lot to work through.

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