[clang] [analyzer] Set and display CSA analysis entry points as notes on debugging (PR #84823)

[via cfe-commits]

NagyDonat wrote:

> Did you envision [debug] XYZ, and XYZ [-analyzer-note-analysis-entry-points]?
Which should I pursue?

I slightly prefer [debug] because this mode can be activated by two different flags, but mentioning the flag is also fine.

(Sorry for not answering earlier, I didn't have a strong preference.)

https://github.com/llvm/llvm-project/pull/84823