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

[Vassil Vassilev via cfe-commits]

vgvassilev wrote:

Is the bot configured to build for arm64 and run on arm32 somehow? But in either case the width of the `int` type should be the same, right?

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