[clang] [clang-repl] Extend the C support. (PR #89804)

[Daniel Thornburgh via cfe-commits]

mysterymath wrote:

I did have a means to reproduce this locally, but it's been a long time since I've used it. I should be able to recreate the setup. I'll get back to you with the details when I can; this whole afternoon is booked through pretty solid with meetings for me I'm afraid.

https://github.com/llvm/llvm-project/pull/89804