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

[Daniel Thornburgh via cfe-commits]

mysterymath wrote:

> @jasonmolenda, I am stuck. I could not find how the bot configures llvm and lldb. I built lldb and ran `make check-lldb` but did not fail in the same way. Can you provide a recipe to reproduce the failure?

For some reason it only fails on our Mac LLDB builders, and not our Linux ones. Our LLDB configuration is also quite tortured I'm afraid; it's difficult to reproduce locally. I'm not sure whether this issue would be seen on a clean Mac build; it seems like it might be some kind of pointer Heisenbug or something. I can definitely test a candidate fix, but that's about it.

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