[clang] [clang-repl] Lay the foundation of pretty printing for C. (PR #89811)

[David Spickett via cfe-commits]

DavidSpickett wrote:

> My feeling is the latter but how can we get a debug build and debug?

I'm going to try a UBSAN build on the chance it pinpoints the issue right away, but failing that it'll be cross compiling to Arm 32 bit and using qemu-user to run the unit test binary. I will get you instructions on how to do that (will be tomorrow at this point).

If this is a generic 32 bit problem you could also build for 32 bit on x86. I don't know if it is because there are no bots for that.

https://github.com/llvm/llvm-project/pull/89811