[clang] [clang][Interp] Implement inc/dec for IntegralAP (PR #69597)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

FWIW, when the description for the PR says it can't be merged for some reason, it usually goes on the bottom of my review queue until those issues are addressed. It's difficult to accept known-broken code. :-(

https://github.com/llvm/llvm-project/pull/69597