[clang] [clang-repl] Lay the basic infrastructure for pretty printing of types (PR #148701)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Precommit CI found some crashing issues that will need to be addressed, and I had some more testing requests to make sure we handle basics properly.

https://github.com/llvm/llvm-project/pull/148701