[clang] [clang][analyzer] Add plist macro formatting (PR #156046)

[Donát Nagy via cfe-commits]

NagyDonat wrote:

I also support unconditionally returning formatted macros for all consumers.

My only potential concern is that there could be some outlier macros where the pretty-printed layout is (visually) inflated (e.g. perhaps something like `if (A) { if (B) { if (C) { ... } } }`) which would perhaps mess up the layout of GUIs that display the results of the analyzer. However, there are already macros whose expansion is pretty large, so I don't think that this is a serious issue.

https://github.com/llvm/llvm-project/pull/156046