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

[Vassil Vassilev via cfe-commits]

vgvassilev wrote:

Very strange. I did not see a lot of platforms failing. If we decide to keep that commit, is there a way to disable this test for exactly that platform?

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